Method and system for obtaining optical prescription based on determined value of fatigue parameter

Abstract

The present disclosure relates to a method for obtaining an optical prescription. The method includes determining, for at least two intermediate optical prescriptions of a plurality of intermediate optical prescriptions, values of a fatigue parameter associated with a visual fatigue level of a subject performing a visual task involving any kind of visual content, each determined value of the fatigue parameter is associated with a respective intermediate optical prescription of the plurality of intermediate optical prescriptions; comparing the determined values of the fatigue parameter; and obtaining the optical prescription based on a comparison of the determined values of the fatigue parameter. A system for obtaining an optical prescription is also disclosed.

Description

Technical Field

[0001] Various aspects of the present disclosure relate to a method and system for deriving an optical prescription based on a determined value of a fatigue parameter. Background Art

[0002] Visual fatigue refers to complex eye and vision-related problems caused by performing tasks that require long-term visual concentration or focus. Visual fatigue can be related to and used interchangeably with the terms "computer vision syndrome" and "digital eye fatigue", which are caused by long-term near work on digital devices such as computers, tablets, mobile phones and e-readers. Due to modern lifestyles, the use of such digital devices and the prevalence of visual fatigue have been increasing in the past two decades. Factors that cause visual fatigue include poor lighting, glare on digital screens, inappropriate viewing distance, long working hours, the subject's alert level, light spectrum, reduced contrast, small fonts, and uncorrected, undercorrected or poorly corrected refractive errors (such as uncorrected astigmatism and / or presbyopia). In some cases, visual fatigue may not necessarily be associated with the use of digital devices.

[0003] Conventional methods for obtaining optical prescriptions focus on maximizing visual acuity, while typically ignoring visual fatigue levels. Further, there is often more than one optical prescription that provides the same or similar visual acuity, and eye care practitioners must make arbitrary and subjective decisions to select the "correct" optical prescription. Therefore, it is difficult for eye care practitioners to objectively obtain an optical prescription that maximizes visual acuity and minimizes visual fatigue at the same time. Often, suboptimal optical prescriptions lead to long-term effects manifested as increased visual fatigue, and sometimes, an optical prescription with a lower visual acuity level may actually achieve higher visual comfort in the long term.

[0004] It would therefore be desirable to seek improved means for determining an optical prescription that minimizes visual fatigue and discomfort while providing good visual acuity. Summary of the invention

[0005] An object of the present disclosure is to provide a method and system for obtaining an optical prescription that maximizes visual acuity and simultaneously minimizes visual fatigue. To this end, the provided method and system are used to: determine the value of a fatigue parameter for at least two intermediate optical prescriptions among a plurality of intermediate optical prescriptions; compare the determined values ​​of the fatigue parameter; and obtain the optical prescription based on the comparison of the determined values ​​of the fatigue parameter. These methods can be implemented on a computing system to determine the value of the fatigue parameter for the at least two intermediate optical prescriptions, and provide automatic comparison and obtain the optical prescription. The method and system of the present disclosure provide an objective means for guiding, optimizing and fine-tuning the intermediate optical prescription by further determining the level of visual fatigue to provide an optical prescription that improves the overall eye health of the subject. In addition, the present disclosure provides a simple and quick method for obtaining an optical prescription, which can be easily implemented by an eye care practitioner.

[0006] The optical prescription may be particularly applicable to the prescription of optical articles (eg, eyewear devices, including eyeglasses, sunglasses, contact lenses) adapted for human vision, and may be adapted for use by emmetropic or ametropic subjects.

[0007] A first aspect of the present disclosure relates to a method for obtaining an optical prescription, the method comprising: (i.) determining a value of a fatigue parameter for at least two intermediate optical prescriptions among a plurality of intermediate optical prescriptions, the fatigue parameter being associated with a level of visual fatigue of a subject performing a visual task involving any kind of visual content, wherein each determined value of the fatigue parameter is associated with a corresponding intermediate optical prescription among the plurality of intermediate optical prescriptions; (ii.) comparing the determined values ​​of the fatigue parameter; and (iii.) obtaining an optical prescription based on the comparison of the determined values ​​of the fatigue parameter.

[0008] In various embodiments, the method further comprises determining the plurality of intermediate optical prescriptions, the plurality of intermediate optical prescriptions being different from one another.

[0009] In various embodiments, the method further includes receiving the plurality of intermediate optical prescriptions, the plurality of intermediate optical prescriptions being different from one another.

[0010] In multiple different embodiments, obtaining an optical prescription based on comparison of determined values ​​of fatigue parameters includes: (i.) selecting a determined value of the fatigue parameter corresponding to a minimum visual fatigue level from the determined values ​​of the fatigue parameter; and (ii.) obtaining an optical prescription based on a corresponding intermediate optical prescription in the intermediate optical prescription associated with the determined value of the fatigue parameter corresponding to the minimum visual fatigue level.

[0011] In various embodiments, each intermediate optical prescription of the plurality of intermediate optical prescriptions comprises a value of a refractive optical parameter associated with a visual acuity condition of the subject.

[0012] In several different embodiments, each intermediate optical prescription of the plurality of intermediate optical prescriptions includes an optical parameter set, which includes a plurality of refractive optical parameters and corresponding values ​​associated with corresponding refractive optical parameters of the plurality of refractive optical parameters, wherein the plurality of refractive parameters are associated with the visual acuity condition of the subject.

[0013] In several different embodiments, determining the value of the fatigue parameter for each intermediate optical prescription in the multiple intermediate optical prescriptions includes: (i.) performing at least one objective measurement related to the subject; (ii.) performing at least one subjective measurement related to the subject; (iii.) obtaining at least one parameter related to information about the subject, or any combination of the above.

[0014] In several different embodiments, the at least one objective measurement associated with the subject includes: at least one pupil tracking measurement associated with the subject's level of visual fatigue while performing a visual task involving any kind of visual content, a critical flicker fusion frequency measurement, an accommodative microfluctuation measurement, a blink frequency measurement, a blink amplitude measurement, and / or a measurement associated with the subject's facial features.

[0015] In various embodiments, the at least one subjective measurement associated with the subject comprises at least one response by the subject performing a visual task involving any kind of visual content to at least one question associated with the subject's level of visual fatigue.

[0016] In various embodiments, the method further includes determining a baseline value for a fatigue parameter that is associated with a baseline level of visual fatigue of the subject performing a visual task involving any kind of visual content, wherein the baseline value for the fatigue parameter is determined prior to determining the plurality of intermediate optical prescriptions.

[0017] In various embodiments, the method further includes calculating a difference between the determined value of the fatigue parameter associated with a corresponding intermediate optical prescription of the plurality of intermediate optical prescriptions and a baseline value of the fatigue parameter.

[0018] A second aspect of the present disclosure relates to a system for obtaining an optical prescription, the system comprising: (i.) a device for determining the value of a fatigue parameter for at least two intermediate optical prescriptions among a plurality of intermediate optical prescriptions, the fatigue parameter being associated with a level of visual fatigue of a subject performing a visual task involving any kind of visual content, wherein each determined value of the fatigue parameter is associated with a corresponding intermediate optical prescription among the plurality of intermediate optical prescriptions; (ii.) a device for comparing the determined values ​​of the fatigue parameter; and (iii.) a device for obtaining an optical prescription based on the comparison of the determined values ​​of the fatigue parameter.

[0019] In various embodiments, at least one of the means for determining the value of the fatigue parameter for the at least two intermediate optical prescriptions of the plurality of intermediate optical prescriptions, the means for comparing the determined values ​​of the fatigue parameter, and the means for obtaining the optical prescription comprises circuitry.

[0020] In various embodiments, the system further comprises means for determining the plurality of intermediate optical prescriptions, the plurality of intermediate optical prescriptions being different from one another, wherein the means for determining the plurality of intermediate optical prescriptions comprises circuitry.

[0021] In various embodiments, the system further comprises means for receiving the plurality of intermediate optical prescriptions, the plurality of intermediate optical prescriptions being different from one another, wherein the means for receiving the plurality of intermediate optical prescriptions comprises circuitry.

[0022] Another aspect of the present disclosure relates to a computer program product comprising instructions for causing the system of the second aspect to perform the steps of the method of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] With reference to the detailed description, the present disclosure will be better understood when considered in conjunction with the non-limiting examples and accompanying drawings, in which:

[0024] - Figure 1A and Figure 1B shows schematic illustrations of methods 100A, 100B for obtaining an optical prescription according to various embodiments;

[0025] - Figure 2 An exemplary embodiment 200 is shown for obtaining an optical prescription where the intermediate optical prescription comprises a set of optical parameters; and

[0026] - Figure 3A and Figure 3B Schematic illustrations of exemplary embodiments 300A, 300B for obtaining an optical prescription where the intermediate optical prescription includes values ​​of refractive optical parameters; and

[0027] - Figure 4 A schematic illustration of a system 400 for obtaining an optical prescription is shown in accordance with various embodiments. DETAILED DESCRIPTION

[0028] The following detailed description refers to the accompanying drawings, which illustrate the specific details and embodiments in which the present disclosure may be implemented. These embodiments are described in sufficient detail to enable those skilled in the art to implement the present disclosure. Other embodiments and structural and logical changes may also be utilized without departing from the scope of the present disclosure. Various embodiments are not necessarily mutually exclusive, as some embodiments may be combined with one or more other embodiments to form new embodiments.

[0029] Features described in the context of one embodiment may be correspondingly applicable to the same or similar features in other embodiments. Features described in the context of one embodiment may be correspondingly applicable to other embodiments, even if not explicitly described in these other embodiments. In addition, supplements and / or combinations and / or alternatives described for a feature in the context of one embodiment may be correspondingly applicable to the same or similar features in other embodiments.

[0030] In the context of various embodiments, the articles "a", "an", and "the" used in conjunction with features or elements include reference to one or more of these features or elements. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0031] Reference signs included in parentheses in the claims are intended to facilitate understanding of the present disclosure and have no limiting effect on the scope of the claims.

[0032] According to various embodiments, as used herein, the term "optical prescription" broadly refers to an optical measurement or prescription for correcting a subject's refractive error that achieves optimal visual acuity while minimizing visual fatigue.

[0033] According to a number of different embodiments, as used herein, the term "intermediate optical prescription" may refer to an intermediate prescription for correcting refractive error, which may be determined subjectively by a subject during a refractive examination. During a refractive examination, there are typically two more possible subjectively determined refractive levels that achieve the same or similar visual acuity levels and immediate visual comfort. It is difficult for the subject to distinguish the subtle differences in visual acuity between the determined refractive levels, and it is difficult to select the best optical prescription during the examination. Therefore, the intermediate optical prescription may refer to a prescription that achieves the same or similar visual acuity and immediate visual comfort for the subject, such as the determined refractive level. In some embodiments, the value of the intermediate optical prescription may be equal to or greater than 0.02logMAR (logarithm of the minimum angle of resolution). In an embodiment, the intermediate optical prescription includes refractive optical parameters. In another embodiment, the intermediate optical prescription includes a set of refractive optical parameters. In a number of different embodiments, the intermediate optical prescription may be, for example, a monocular measurement result for one eye, or may be, for example, a binocular measurement result for two eyes.

[0034] According to a number of different embodiments, as used herein, the term "value" may refer to a numerical value, such as a discrete numerical value or a numerical range. Alternatively or in addition, the term "value" may refer to text, such as a string of text, such as "yes" or "no". In some embodiments, text may be assigned a quantitative value (e.g., a numerical value) or associated with it.

[0035] According to various embodiments, as used herein, the term "subject" may refer to any individual who undergoes an optical examination (eg, asthenopia and / or refraction examination) for obtaining an optical prescription.

[0036] According to a number of different embodiments, as used herein, the term "visual fatigue level" refers to the level, state, or degree of visual fatigue of a subject. For example, the visual fatigue level may be associated with the occurrence of one or more visual fatigue symptoms, such as but not limited to eye fatigue, blurred vision, eye discomfort, redness, and / or difficulty concentrating. In a number of different embodiments, the visual fatigue level may refer to the subject's perception of his / her visual fatigue state when performing a visual task. Alternatively or in addition, the visual fatigue level may also include other fatigue parameters, such as cognitive fatigue, systemic fatigue, or muscle fatigue caused by a visual task.

[0037] According to a number of different embodiments, as used herein, the term "visual task" may refer to a task that includes visual content assigned to a subject, or any type of task that has visual requirements. The visual content may be displayed on a digital device such as a screen, or may be provided on paper, or otherwise provided in an environment where the subject is viewing. In some embodiments, the visual task may be personalized according to the subject's current optical prescription, habitual tasks, or may be adapted to the test environment, for example, by adjusting parameters such as font, color, contrast, etc. of the visual task.

[0038] According to various embodiments, the term "refractive optical parameters" may refer to objective measurements of a subject's refractive error obtained during a refractive examination and may be associated with the subject's visual acuity condition. Non-limiting examples of refractive optical parameters may include a subject's spherical parameter, a cylindrical parameter, a cylindrical axis parameter, a lower light addition parameter, a pupil diameter parameter, an axial length parameter, a binocular balance parameter. In various embodiments, the refractive optical parameters may be monocular, or may be binocular. The refractive optical parameters may be obtained using any refractive testing instrument (e.g., a comprehensive refractometer, a refractor, an ophthalmometer, an autorefractometer, and / or a retinoscope).

[0039] Figure 1A and Figure 1B Schematic illustrations of methods 100A, 100B for obtaining an optical prescription according to various embodiments are shown. Figure 1A , method 100A includes: (i.) determining a value of a fatigue parameter ("fatigue measurement") for at least two intermediate optical prescriptions of a plurality of intermediate optical prescriptions, the fatigue parameter being associated with a level of visual fatigue of a subject performing a visual task involving any kind of visual content, wherein each determined value of the fatigue parameter is associated with a corresponding intermediate optical prescription of the plurality of intermediate optical prescriptions (step 102); (ii.) comparing the determined values ​​of the fatigue parameter (step 104); and (iii.) obtaining an optical prescription based on the comparison of the determined values ​​of the fatigue parameter (step 106). In various embodiments, obtaining an optical prescription of step 106 may further include: (i.) selecting the determined value of the fatigue parameter corresponding to the lowest level of visual fatigue from the determined values ​​of the fatigue parameter; and (ii.) obtaining an optical prescription based on the corresponding intermediate optical prescription of the intermediate optical prescription associated with the determined value of the fatigue parameter corresponding to the lowest level of visual fatigue.

[0040] In method 100A, determining the value of the fatigue parameter for each intermediate optical prescription (e.g., performing fatigue measurement) may include: (i.) performing at least one objective measurement associated with the subject; (ii.) performing at least one subjective measurement associated with the subject; (iii.) obtaining at least one parameter associated with the subject's information, or any combination of the foregoing steps. The at least one objective measurement and the subjective measurement may be associated with, for example, in response to, a level of visual fatigue of the subject performing a visual task involving any kind of visual content. In some embodiments, determining the value of the fatigue parameter may include performing the at least one objective measurement, performing the at least one subjective measurement, and obtaining at least one parameter associated with the subject's information.

[0041] In various embodiments, objective measurements may be made using one or more refractive testing instruments (e.g., refractor, ophthalmometer) and / or fatigue testing instruments (e.g., eye tracker, sensor such as camera). The fatigue testing instrument may be integrated with the refractive testing instrument, or may be a stand-alone device. In some embodiments, the refractive testing instrument and the fatigue testing instrument may cooperate with a microprocessor to determine the value of a fatigue parameter. The at least one objective measurement may include a pupil tracking measurement, such as an eye tracking measurement. For example, an eye tracker or camera may be used to track the movement of a subject's eyes or pupils in real time in response to a visual task, and the movement may be converted into data containing information related to pupil position, gaze vectors for each eye, and gaze points. The at least one objective measurement may also include a critical flicker fusion frequency (CFFF) measurement. For example, a transition point of intermittent light with increasing temporal frequency may be measured at which the flickering stops and the light is perceived by the subject as continuous light. The at least one objective measurement may also include adjusting micro-fluctuation measurements, such as but not limited to pupil micro-fluctuations and fixation eye movement parameters, and adjusting micro-fluctuation measurements may correspond to tremors or temporal eye instability caused by ciliary muscle spasms when performing visual tasks. The at least one objective measurement may also include blinking frequency and blinking amplitude measurements. For example, an eye tracker or camera may be used to determine the blinking frequency, blinking amplitude (e.g., eyelid closure intensity, eyelid spasm, and / or eyelid closure duration) of the subject in real time in response to a visual task. The at least one objective measurement may also include measurements related to the subject's facial features (such as eyes, mouth or head), and corresponding calculations of its aspect ratio. For example, smaller eye opening, larger mouth opening, and head-down frequency may be measured, and may indicate the subject's visual fatigue level. Any combination of the aforementioned objective measurements is possible.

[0042] In a number of different embodiments, the at least one subjective measurement may include at least one answer to at least one question related to the subject's visual fatigue level by a subject performing a visual task involving any type of visual content. Therefore, the subjective measurement result may include a result that is at least partially dependent on the subject's response (e.g., a questionnaire), which may be measured during a visual fatigue examination. Non-limiting examples of such questionnaires include symptom-based questionnaires, such as the Conlon Visual Discomfort Survey and the Convergence Insufficiency Symptom Survey. Any combination of the foregoing subjective measurements is possible.

[0043] In various embodiments, the at least one parameter related to the subject's information may include: personal information, such as age, gender, race, country or city of residence, or a combination thereof; or information related to the subject's digital device usage and behavior. Any combination of the aforementioned information of the subject is possible.

[0044] It is contemplated that the value of the fatigue parameter may be determined for at least two of the plurality of intermediate optical prescriptions based on at least one prediction model that provides a relationship between the value of the fatigue parameter and at least one objective measurement result, at least one subjective measurement result, and / or the at least one parameter related to the information of the subject. The prediction model may be implemented using a machine learning algorithm that may be selected from the group consisting of: supervised learning, semi-supervised learning, and unsupervised learning. For example, one or more neural networks may be trained by inputting a series of objective measurements, subjective measurements, and / or parameters related to the information of the subject; and establishing a correlation table or any database containing information about the relationship between the value of the fatigue parameter and the objective measurements, subjective measurements, and / or parameters related to the information of the subject.

[0045] refer to Figure 1B , method 100B may further include determining the plurality of intermediate optical prescriptions, and the plurality of intermediate optical prescriptions may be different from each other (step 108). The plurality of intermediate optical prescriptions may be determined by the refractive testing instrument during the refractive examination, and may include different intermediate optical prescriptions that achieve the same or similar level of visual acuity and immediate visual comfort for the subject. At step 102, a value of a fatigue parameter is then determined for at least two of the determined intermediate optical prescriptions. In other words, the step of determining the value of the fatigue parameter may be integrated into the refractive examination process and may be performed with respect to at least two intermediate optical prescriptions determined during the refractive examination process.

[0046] Alternatively or in addition, method 100B may further include receiving the plurality of intermediate optical prescriptions, and the plurality of intermediate optical prescriptions may be different from each other (step 110). In this embodiment, the intermediate optical prescription may be determined before determining the value of the fatigue parameter, and the intermediate optical prescription may be stored in an external source, or in a memory of a separate refractive testing instrument. In other words, the value of the fatigue parameter may be determined in a separate measurement (e.g., a stand-alone device), and may not be integrated with the refractive examination process used to determine the intermediate optical prescription.

[0047] In some embodiments, method 100B may include both determining an intermediate optical prescription (step 108) and receiving an intermediate optical prescription (step 110).Values ​​of the fatigue parameter may be determined for the determined and received plurality of intermediate optical prescriptions.

[0048] like Figure 1B As shown, method 100B may further include determining a baseline value of a fatigue parameter that is associated with a baseline level of visual fatigue of a subject performing a visual task involving any kind of visual content (step 112). The baseline value of the fatigue parameter may be determined before determining the plurality of intermediate optical prescriptions. For example, prior to a refractive examination process for determining the plurality of intermediate optical prescriptions (step 108) and / or receiving (step 110) the plurality of intermediate optical prescriptions, at least one of the above-described objective and / or subjective measurements may be performed, and / or a parameter associated with information about the subject may be obtained. In an example, a baseline value of the fatigue parameter may be determined at the beginning of a visual fatigue testing process to determine the value of the fatigue parameter for at least two of the plurality of intermediate optical prescriptions (step 102).

[0049] In various embodiments, the method 100B further includes calculating a difference between the determined value of the fatigue parameter associated with the corresponding intermediate optical prescription in the plurality of intermediate optical prescriptions (step 106) and the baseline value of the fatigue parameter (step 112). This can allow an eye care practitioner to distinguish the visual fatigue level associated with the corresponding intermediate optical prescription in the intermediate optical prescriptions from the visual fatigue level caused by the examination process itself and other types of fatigue (e.g., cognitive fatigue, systemic fatigue, muscle fatigue).

[0050] Figure 2An exemplary embodiment 200 for obtaining an optical prescription where an intermediate optical prescription includes an optical parameter set is shown. In some embodiments, the optical parameter set (e.g., the intermediate optical prescription) may include a plurality of refractive optical parameters, each refractive optical parameter having a corresponding value associated with a corresponding refractive optical parameter of the plurality of refractive optical parameters. The plurality of refractive optical parameters may be associated with a visual acuity condition of a subject. For example, the refractive optical parameter set may include a value of a spherical parameter of a subject, a value of a cylindrical parameter of a subject, and a value of a cylindrical axis parameter of a subject obtained from a refractive examination. The refractive optical parameter set may be used to correct a refractive error of a subject to provide good visual acuity.

[0051] refer to Figure 1A , Figure 1B and Figure 2 The plurality of intermediate optical prescriptions may be determined during a refractive examination (step 108); and / or received from an external source (step 110). Figure 2 As shown, the plurality of intermediate optical prescriptions may include a first optical parameter set 202, a second optical parameter set 204, and up to an Nth (N≥2) optical parameter set 206, each optical parameter set providing the same or similar visual acuity for the subject.

[0052] Thus, step 102 may include determining a value of a fatigue parameter (eg, a fatigue measurement result) for at least two of the first to Nth optical parameter sets 202, 204, 206. Figure 2 As shown, a first value 212 of the fatigue parameter may be obtained for the first optical parameter set 202 , a second value 214 of the fatigue parameter may be obtained for the second optical parameter set 204 , and an Nth value 216 of the fatigue parameter may be obtained for up to the Nth (N≥2) optical parameter sets 206 .

[0053] Thus, step 104 may include comparing the determined values ​​of the fatigue parameter. For example, the first value 212, the second value 214, and the up to Nth value 216 of the fatigue parameter may be compared to each other. In some embodiments, step 104 may further include calculating the difference between the determined values ​​of the fatigue parameter (e.g., the first value 212, the second value 214, and the up to Nth value 216) and the baseline value of the fatigue parameter (step 112). This may allow the eye care practitioner to distinguish the visual fatigue level associated with the corresponding optical parameter set in the first optical parameter set 202, the second optical parameter set 204, and the up to Nth optical parameter set 206 from other fatigue types. For example, a value of the calculated difference being below a predetermined threshold may indicate that the first value 212, the second value 214, and the up to Nth value 216 of the fatigue parameter may be attributed to the subject's visual fatigue level associated with the corresponding optical parameter set in the first optical parameter set 202, the second optical parameter set 204, and the up to Nth optical parameter set 206.

[0054] The final optical prescription 220 (step 106) can be obtained based on the comparison of the determined values ​​of the fatigue parameter by selecting the determined value of the fatigue parameter corresponding to the lowest visual fatigue level from the determined values ​​of the fatigue parameter, for example, the lowest determined value of the fatigue parameter; and obtaining the corresponding intermediate optical prescription associated with the determined value of the fatigue parameter corresponding to the lowest vision among the intermediate optical prescriptions as the final optical prescription 220. For example, the final optical prescription 220 can be obtained by selecting the lowest value of the fatigue parameter among the first value 212, the second value 214, and up to the Nth value 216 of the fatigue parameter; and selecting the corresponding optical parameter set corresponding to the lowest value of the fatigue parameter. Accordingly, the final optical prescription 230 thus corresponds to an optical prescription that provides a lower visual fatigue level and lower visual discomfort as well as good visual acuity.

[0055] Figure 3A A schematic illustration of an exemplary embodiment 300A for obtaining an optical prescription where the intermediate optical prescription includes values ​​of refractive optical parameters is shown. The refractive optical parameters may be associated with a visual acuity condition of a subject. For example, the values ​​of the refractive optical parameters may correspond to values ​​of a spherical parameter of the subject, values ​​of a cylindrical parameter of the subject, values ​​of a cylindrical axis position parameter of the subject, values ​​of a binocular balance parameter of the subject.

[0056] refer to Figure 1A , Figure 1B , Figure 3A and Figure 3B The value of the refractive optical parameter (e.g., the intermediate optical prescription) can be determined during the refractive examination (step 108), and / or can be received from an external source (step 110). Figure 3AIn the example shown, first value 302, second value 304, and up to Mth (M≥2) value 306 of the subject's spherical power may be obtained. First value 302, second value 304, and up to Mth value 306 of the spherical power may each achieve the same or similar visual acuity for the subject.

[0057] Thus, step 102 may include determining a value of a fatigue parameter (eg, a fatigue measurement result) for at least two of the first to Mth values ​​302, 304, 306 of a refractive optical parameter (eg, spherical power). Figure 3A As shown, a first value 312 of the fatigue parameter can be obtained for a first value 302 of the spherical power, a second value 314 of the fatigue parameter can be obtained for a second value 304 of the spherical power, and an Mth value 316 of the fatigue parameter can be obtained for up to an Mth (M≥2)th value 306 of the spherical power.

[0058] Step 104 may be performed to compare the determined values ​​of the fatigue parameter. For example, the first value 312, the second value 314, up to the Mth value 316 of the fatigue parameter for spherical power may be compared to each other. In some embodiments, step 104 may further include calculating the difference between the determined values ​​of the fatigue parameter (e.g., the first value 312, the second value 314, up to the Mth value 316) and the baseline value of the fatigue parameter (step 112), which may allow the eye care practitioner to distinguish the visual fatigue level associated with the corresponding values ​​of the first value 302, the second value 304, and up to the Mth value 306 of the spherical power from various other types of fatigue.

[0059] Therefore, step 106 may include selecting the determined value of the fatigue parameter corresponding to the lowest visual fatigue level (e.g., the lowest determined value of the fatigue parameter), and obtaining the corresponding spherical power associated with the determined value of the fatigue parameter corresponding to the lowest visual fatigue level among the spherical powers as the final spherical power 320. For example, the final spherical power 320 prescription may be obtained by: selecting the lowest value of the fatigue parameter among the first value 312, the second value 314, and up to the Mth value 316 of the fatigue parameter; and selecting the corresponding spherical power corresponding to the lowest value of the fatigue parameter. The final spherical power 230 may be part of a final optical prescription 360 that minimizes visual fatigue and provides good visual acuity for the subject at the same time.

[0060] In such Figure 3AIn the illustrated embodiment, steps 102, 104, and 106 may be repeated for each refractive optical parameter of the intermediate optical prescription. For example, after obtaining the final spherical power 320, step 102 may be performed to determine the value of the fatigue parameter for at least two values ​​of the refractive optical parameter corresponding to the binocular balance of the subject. For example, a first value 342 of the fatigue parameter may be obtained for the first value 332 of binocular balance, a second value 344 of the fatigue parameter may be obtained for the second value 334 of binocular balance, and an Mth value 346 of the fatigue parameter may be obtained for up to an Mth value 336 of binocular balance. Then, step 104 may be performed to compare the determined values ​​of the fatigue parameter (e.g., the first value 342, the second value 344, and up to an Mth value 346 of the fatigue parameter for binocular balance). In some embodiments, step 104 may further include calculating a difference between the determined value of the fatigue parameter and the baseline value of the fatigue parameter (step 112).

[0061] Therefore, step 106 may include selecting the determined value of the fatigue parameter corresponding to the lowest level of visual fatigue (e.g., the lowest determined value of the fatigue parameter), and obtaining a corresponding binocular balance value among the binocular balance values ​​associated with the determined value of the fatigue parameter corresponding to the lowest level of visual fatigue as the final binocular balance 350. The final binocular balance value 350 may be part of a final optical prescription 360 that minimizes visual fatigue and provides good visual acuity for the subject at the same time.

[0062] In some embodiments, the determination of the value of the fatigue parameter (step 102) can be performed continuously when the refractive optical parameter is determined (step 108) during the refractive examination and / or when the refractive optical parameter is received (step 110) during the visual fatigue examination process. For example, each fatigue measurement result can be associated with a timestamp during the examination process, and the measurement result can be retrieved at the end of the examination. Therefore, the visual fatigue measurement result can guide the refractive examination, or optimize the visual fatigue examination in real time, so that a final optical prescription 360 that achieves good visual acuity and minimal visual fatigue can be obtained.

[0063] Figure 3B A schematic illustration of an exemplary embodiment 300B for obtaining an optical prescription in case the intermediate optical prescription comprises values ​​of refractive optical parameters is shown.The refractive optical parameters may be associated with the visual acuity condition of the subject. Figure 3B Can be based on reference Figure 3A The embodiment described herein is described, and repeated descriptions will be omitted for the sake of brevity. However, in embodiment 300B, determining the value of the fatigue parameter may be performed for the selected refractive optical parameter.

[0064] In embodiment 300B, a plurality of intermediate optical prescriptions, such as first to Pth (P≥2) values ​​372 of spherical power, may be determined (step 108) and / or received (step 110) as described above. Step 102 may be performed to determine a value 382 of a fatigue parameter for at least two of the P values ​​of spherical power. In some embodiments, steps 104 and 106 may be performed to obtain a final spherical power.

[0065] Embodiment 300B may further include determining (step 108) and / or receiving (step 110) a plurality of intermediate optical prescriptions, such as first to Pth values ​​374 of cylindrical power. Figure 3B As shown, fatigue measurements for the P values ​​374 of cylindrical power may not be performed.

[0066] Embodiment 300B may further include determining (step 108) and / or receiving (step 110) a plurality of intermediate optical prescriptions, such as first to Pth values ​​376 of the cylindrical axis. Figure 3B As shown, step 102 may be performed to determine a value 386 of the fatigue parameter for at least two of the P values ​​of the cylinder axis. In some embodiments, steps 108 and 110 may also be performed to obtain a final value for the cylinder axis.

[0067] Embodiment 300B may further include determining (step 108) and / or receiving (step 110) a plurality of intermediate optical prescriptions, such as a first value to a third value 378 of the additional power. Figure 3B As shown, fatigue measurements may not be performed for the P values ​​378 of the add power.

[0068] In embodiment 300B, the final optical prescription 390 can therefore be obtained based on the values ​​of the refractive optical parameters determined (step 108) and / or received (step 110), and for the selected refractive optical parameters by determining the values ​​of the fatigue parameters for the values ​​of the refractive optical parameters. In other words, fatigue measurement can be performed only for the selected refractive optical parameters, for example at selected time points of the refractive examination process or visual fatigue examination process. This can help speed up the examination process and prevent the subject from being overly fatigued during the process. In addition, the fatigue measurement results for the selected refractive optical parameters can guide the determination of the final optical prescription 390. In this way, an optical prescription 390 with good visual acuity and minimal visual fatigue can be obtained.

[0069] According to a second aspect of the present disclosure, a system for obtaining an optical prescription is provided. Figure 4A schematic illustration of a system 400 for obtaining an optical prescription according to various embodiments is shown. The system 400 may be based on the steps of methods 100A, 100B, 200, 300A, 300B and configured to perform the above steps, and repeated descriptions will be omitted for brevity.

[0070] System 400 includes: (i.) a device 402 for determining the value of a fatigue parameter for at least two intermediate optical prescriptions among a plurality of intermediate optical prescriptions, the fatigue parameter being associated with a level of visual fatigue of a subject performing a visual task involving any kind of visual content, wherein each determined value of the fatigue parameter is associated with a corresponding intermediate optical prescription among the plurality of intermediate optical prescriptions; (ii.) a device 404 for comparing the determined values ​​of the fatigue parameter; and (iii.) a device 406 for obtaining an optical prescription based on the comparison of the determined values ​​of the fatigue parameter.

[0071] In various embodiments, at least one of the means 402 for determining the value of the fatigue parameter for at least two of the plurality of intermediate optical prescriptions, the means 404 for comparing the determined values ​​of the fatigue parameter, and the means 406 for obtaining the optical prescription comprises a circuit. The circuit may comprise an analog circuit or component, a digital circuit or component, or a hybrid circuit or component. According to alternative embodiments, any other type of implementation of the corresponding functions described in more detail below may also be understood as a "circuit". A digital circuit may be understood as any type of logic implementation entity, which may be a dedicated circuit or a processor that executes software, firmware, or any combination thereof stored in a memory. Therefore, in various embodiments, a "circuit" may be a digital circuit, such as a hard-wired logic circuit or a programmable logic circuit, such as a programmable processor, such as a microprocessor (e.g., a complex instruction set computer (CISC) processor or a reduced instruction set computer (RISC) processor). A "circuit" may also include a processor that executes software, such as any type of computer program, such as a computer program using a virtual machine code (such as Java). For example, at least one of the device 402 for determining the value of the fatigue parameter for the at least two intermediate optical prescriptions among the multiple intermediate optical prescriptions, the device 404 for comparing the determined values ​​of the fatigue parameter, and the device 406 for obtaining the optical prescription can be a microprocessor, such as a fatigue testing instrument (e.g., an eye tracker, a camera), and in some embodiments can be a refractive testing instrument (e.g., a refractor, an ophthalmometer).

[0072] In some embodiments, Figure 4As shown, the system 400 may further include a device 408 for determining the plurality of intermediate optical prescriptions, each of the plurality of intermediate optical prescriptions being different from the other intermediate optical prescriptions. The device 408 for determining the plurality of intermediate optical prescriptions may be part of the circuit, or may be included in the circuit, for example in the same microprocessor. For example, the fatigue testing instrument may be integrated with the refractive testing device. In this way, fatigue measurements may be performed during the refractive examination, and a direct and simple way of obtaining an optical prescription for the subject may be provided. In addition, the eye care practitioner does not need to perform additional fatigue measurements during the refractive examination process to obtain an optical prescription that provides good visual acuity and minimizes visual fatigue.

[0073] In some other embodiments, such as Figure 4 As shown, the device 410 for receiving the plurality of intermediate optical prescriptions may include a circuit, the plurality of intermediate optical prescriptions being different from each other. In other words, the plurality of intermediate optical prescriptions may be determined in a separate circuit (e.g., a refractive testing instrument) and may be transmitted to a circuit comprising the following means: a device 402 for determining the value of a fatigue parameter for at least two of the plurality of intermediate optical prescriptions, a device 404 for comparing the determined values ​​of the fatigue parameter, and a device 406 for obtaining an optical prescription. For example, the circuit may be an independent device, such as an independent fatigue testing instrument. Therefore, the circuit may be equipped with the device 410 for receiving the plurality of intermediate optical prescriptions. In this embodiment, the plurality of intermediate optical prescriptions may be received according to a predefined wireless communication protocol. Examples of predefined wireless communication protocols include: Global System for Mobile Communications (GSM), Enhanced Data GSM Environment (EDGE), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Wireless Fidelity (Wi-Fi), Voice over Internet Protocol (VoIP), Worldwide Interoperability for Microwave Access (Wi-MAX), Wi-Fi Direct (WFD), Ultra-Wideband (UWB), Infrared Data Association (IrDA), Bluetooth, ZigBee, SigFox, LPWan, LoRaWan, GPRS, 3G, 4G, LTE, and 5G communication systems. Therefore, the means 410 for receiving the plurality of intermediate optical prescriptions may include the necessary hardware required to support wireless transmission. Alternatively, the plurality of intermediate optical prescriptions may be received via wired means.

[0074] Advantageously, various means 402 for determining the value of a fatigue parameter, for example by: performing at least one objective and / or subjective measurement; obtaining at least one parameter associated with the subject, can be easily combined in the circuit. Furthermore, means for displaying visual content associated with the visual task can be integrated in the circuit.

[0075] According to another aspect of the present disclosure, a computer program product may include instructions for causing a system 400 to perform the steps of a method 100A, 100B, 200, 300A, 300B for obtaining an optical prescription.

[0076] Thus, the present disclosure discloses methods and systems for obtaining a subject-specific optical prescription that can be implemented in an optical article (e.g., eyewear, contact lens). These methods and systems can be used to guide, optimize, and fine-tune an intermediate optical prescription by further determining the level of visual fatigue with respect to the intermediate optical prescription to obtain an optical prescription. The optical prescription provides good visual acuity while minimizing the subject's level of visual fatigue. This can improve the subject's overall visual health, particularly when the subject is performing distance (e.g., visual distance and visual distance) work activities.

[0077] Although the present disclosure has been particularly shown and described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined in the appended claims. Therefore, the scope of the present disclosure is indicated by the appended claims, and therefore, all changes within the equivalent meaning and scope of the claims are intended to be included.

Claims

1. A method (100A, 100B) for obtaining an optical prescription, the method comprising: (i.) determining, for at least two of a plurality of intermediate optical prescriptions, a value of a fatigue parameter associated with a level of visual fatigue of a subject performing a visual task involving any kind of visual content, wherein, Each determined value of the fatigue parameter is associated with a corresponding intermediate optical prescription of the plurality of intermediate optical prescriptions (102); (ii.) comparing the determined values ​​of the fatigue parameters (104); (iii.) obtaining the optical prescription (106) based on a comparison of the determined values ​​of the fatigue parameter.

2. The method (100A, 100B) of claim 1, further comprising (i.) determining the plurality of intermediate optical prescriptions, the plurality of intermediate optical prescriptions being different from one another (108).

3. The method (100A, 100B) of claim 1, further comprising (i.) Receiving the plurality of intermediate optical prescriptions, the plurality of intermediate optical prescriptions being different from one another (110).

4. The method (100A, 100B) according to any one of claims 1 to 3, wherein: Obtaining the optical prescription (106) based on the comparison of the determined values ​​of the fatigue parameter includes (i.) selecting the determined value of the fatigue parameter corresponding to the lowest visual fatigue level among the determined values ​​of the fatigue parameter; (ii.) obtaining the optical prescription based on a corresponding intermediate optical prescription among the intermediate optical prescriptions associated with the determined value of the fatigue parameter corresponding to the lowest visual fatigue level.

5. The method (100A, 100B, 300A, 300B) according to any one of claims 1 to 4, wherein: Each intermediate optical prescription of the plurality of intermediate optical prescriptions comprises a value of a refractive optical parameter associated with a visual acuity condition of the subject.

6. The method (100A, 100B, 200) of any one of claims 1 to 4, wherein: Each of the plurality of intermediate optical prescriptions comprises an optical parameter set including a plurality of refractive optical parameters and corresponding values ​​associated with respective ones of the plurality of refractive optical parameters, wherein the plurality of refractive parameters are associated with the visual acuity condition of the subject.

7. The method (100A, 100B, 200, 300A, 300B) according to any one of claims 1 to 6, wherein: Determining the value of the fatigue parameter for each intermediate optical prescription of the plurality of intermediate optical prescriptions comprises (i.) performing at least one objective measurement related to the subject; (ii.) performing at least one subjective measurement associated with the subject; (iii.) obtaining at least one parameter related to information of the subject, or any combination of the above.

8. The method (100A, 100B, 200, 300A, 300B) of claim 7, wherein: The at least one objective measurement associated with the subject includes: at least one pupil tracking measurement associated with the subject's level of visual fatigue while performing the visual task involving any kind of visual content, a critical flicker fusion frequency measurement, an accommodation microfluctuation measurement, a blink frequency measurement, a blink amplitude measurement, and / or a measurement associated with the subject's facial features.

9. The method (100A, 100B, 200, 300A, 300B) of claim 7 or claim 8, wherein: The at least one subjective measurement related to the subject comprises at least one answer by the subject performing the visual task involving any kind of visual content to at least one question related to the subject's level of visual fatigue.

10. The method (100A, 100B, 200, 300A, 300B) of any one of claims 1 to 9, further comprising (i.) determining a baseline value of the fatigue parameter, the baseline value being associated with a baseline level of visual fatigue of the subject performing the visual task involving any kind of visual content (112), in, A baseline value for the fatigue parameter is determined prior to determining the plurality of intermediate optical prescriptions.

11. The method (100A, 100B, 200, 300A, 300B) of claim 10, further comprising (i.) calculating a difference between a determined value of the fatigue parameter associated with a corresponding intermediate optical prescription in the plurality of intermediate optical prescriptions and a baseline value of the fatigue parameter.

12. A system (400) for obtaining an optical prescription, the system comprising (i.) means (402) for determining, for at least two of a plurality of intermediate optical prescriptions, a value of a fatigue parameter associated with a level of visual fatigue of a subject performing a visual task involving any kind of visual content, wherein each determined value of the fatigue parameter is associated with a respective intermediate optical prescription of the plurality of intermediate optical prescriptions; (ii.) means (404) for comparing the determined values ​​of the fatigue parameter; (iii.) means (406) for deriving the optical prescription based on a comparison of the determined values ​​of the fatigue parameter.

13. The system (400) of claim 12, wherein: At least one of the means (402) for determining the value of the fatigue parameter for the at least two intermediate optical prescriptions of the plurality of intermediate optical prescriptions, the means (404) for comparing the determined values ​​of the fatigue parameter, and the means (406) for obtaining the optical prescription comprises a circuit.

14. The system (400) of claim 13, further comprising (i.) means (408) for determining the plurality of intermediate optical prescriptions, the plurality of intermediate optical prescriptions being different from one another, wherein: The means for determining the plurality of intermediate optical prescriptions comprises the circuitry; (ii.) means (410) for receiving the plurality of intermediate optical prescriptions, the plurality of intermediate optical prescriptions being different from one another, wherein the means for receiving the plurality of intermediate optical prescriptions comprises the circuit, or any combination of the above.

15. A computer program product, comprising instructions for causing the system (400) according to any one of claims 12 to 14 to perform the steps of the method (100A, 100B, 200, 300A, 300B) according to any one of claims 1 to 11.

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