Method and system for determining the refractive power of at least one eye of an individual

Abstract

1. A method for determining the refractive power of at least one eye of an individual under specific spectral conditions, the method comprising: an eye illumination step during which the individual's eye is illuminated under said specific spectral conditions, said specific spectral conditions being provided by a polychromatic light source having a spectrum different from a white light source and by color filters positioned in front of the individual's eye and illuminated by the light source; and a power determination step during which the refractive power of the individual's eye is determined under said specific spectral conditions.

Description

Technical Field

[0001] The present invention relates to methods and systems for determining the refractive power of at least one eye of an individual, methods and systems for compensating for the refractive power of an individual's eye, and methods and systems for selecting a color filter for an optical system adapted to an individual.

Background Art

[0002] When the eye is illuminated with polychromatic visible light, different wavelengths of visible light are focused on different planes, i.e., behind (longer wavelengths) or in front (shorter wavelengths) of the retinal plane. The amplitude of this defocus is known as axial chromatic aberration.

[0003] Color filters have recently been increasingly used in glasses not only for sunglasses but also to improve comfort and appearance in various lighting conditions such as at night or in glare, or to account for transitions between different lighting conditions.

[0004] However, color filters change the spectrum of the incident light and can therefore induce refractive abnormalities and degrade comfort or the quality of appearance.

[0005] For example, at a luminance level of 10 candela per square meter (cd / m 2 ), a high-pass band filter (i.e., filtering signals with wavelengths greater than or equal to 600 nm) induces an average of 0.2 diopters (D) of hyperopia, and a low-pass band filter (i.e., filtering signals with wavelengths less than or equal to 500 nm) induces an average of -0.8 D of myopia. The hyperopia can reach 0.4 D for myopes, and the myopia can reach -1.2 D. The change in refractive power is greater for myopes than for hyperopes.

[0006] Refractive abnormalities resulting from polychromatic filters can induce fatigue and may reduce visual performance (visual acuity, contrast sensitivity, reading speed, etc.).

[0007] Furthermore, when identifying glasses suitable for an individual, the prescription of the wearer is often taken into consideration, but the prescription is for standard spectral conditions. Therefore, the refractive power induced by the glasses is not adapted to specific, non-standard spectral conditions. SUMMARY OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION

[0008] Therefore, there is a need for a method and system that can identify the refractive power of at least one eye of an individual according to the spectral characteristics of the light around the individual's eye, compensate for the refractive power of the individual's eye, and select a color filter for an optical system adapted to the individual.

[0009] An object of the present invention is to provide such a method and system. MEANS FOR SOLVING THE PROBLEM

[0010] To that end, the present invention provides a method for identifying the refractive power of at least one eye of an individual under specific spectral conditions, the method comprising: - an eye illumination step in which the individual's eye is illuminated under the specific spectral conditions, the specific spectral conditions being provided by a multi-color light source having a spectrum different from that of a white light source and / or by a color filter positioned in front of the individual's eye and illuminated by a light source; - a refractive power identification step in which the refractive power of the individual's eye is identified under the specific spectral conditions; and including.

[0011] By measuring the refractive power error of the wearer under specific spectral conditions, a prescription adapted to improve the focusing of light on the retina can be created. The wearer will have a sharper field of view and less accommodation load.

[0012] Actually, 10 cd / m 2When a low-pass band filter is used instead of a neutral density filter under the same luminance level, it induces a two-step visual acuity decline on average. The maximum contrast and the average visual acuity at a luminance level of 10 cd / m 2 for a group of 30 healthy subjects are -0.15 log when the incident light is filtered with a neutral density filter having a transmittance of 10%, and +0.12 D when the incident light is filtered with a low-pass band filter having a cut-off value of 500 nm and a transmittance of 10% instead.

[0013] As an advantage, according to the present invention, data related to identifying an optical system adapted to a wearer under specific spectral conditions later can be collected. In fact, the present invention identifies the refractive power of at least one eye of an individual under specific spectral conditions.

[0014] According to another embodiment of the method according to the present invention, - The multi-color light source has a spectrum in which at least one of its color coordinates x or y in the CIE xyY color space is different from the corresponding color coordinate of the black body locus by at least 0.01, preferably at least 0.02, and advantageously at least 0.03, - The color filter has a chroma value higher than exactly 10, preferably higher than exactly 20, and advantageously higher than exactly 30, and / or - The refractive power is determined by using a two-color test, and the colors of the two-color test are selected according to specific spectral conditions.

[0015] Another object of the present invention is a method for identifying a spectrum-refractive power model adapted to an individual, and this method includes: - A specific spectral condition providing step in which a plurality of specific spectral conditions are provided during that time, and - A spectral parameter providing step in which, for each of the specific spectral conditions, at least one spectral parameter related to the specific spectral condition, such as a spectrum or a light quantity, is provided during that time. - During that time, for each of the specific spectral conditions, a refractive power determination step in which the refractive power of at least one eye of an individual is continuously determined according to a method for determining the refractive power of an individual's eye under specific spectral conditions according to the present invention; - During that time, a spectral-refractive power model determination step in which a model of the refractive power of an individual's eye according to the spectral parameters is determined based on each of the refractive powers of the individual's eye and each of the spectral parameters; including.

[0016] Advantageously, according to the present invention, the relationship between the spectral parameters and the refractive power of an individual's eye can be established.

[0017] According to another embodiment of the method according to the present invention, during the spectral-refractive power model determination step, the model is determined by interpolation and / or extrapolation of the refractive power of an individual's eye according to the spectral parameters.

[0018] Another object of the present invention is a method for determining the refractive power of at least one eye of an individual under specific spectral conditions, the method comprising: - A spectral-refractive power model providing step during which a model of the refractive power of at least one eye according to the spectral parameters is provided; - A spectral parameter providing step during which at least one spectral parameter regarding the specific spectral conditions of an individual is provided; - A refractive power determination step during which the refractive power of an individual's eye under specific light conditions is determined based on the model and the light parameters; including.

[0019] By such a method, it becomes possible to predict and compensate for refractive errors induced by specific spectral conditions without measuring them. This result is more general-purpose than personalized. Such a method is particularly beneficial for corrective lenses for emmetropes.

[0020] As an advantage, the present invention enables the determination of an individual's eye refractive power at a location away from the individual's eye without using an instrument.

[0021] According to another embodiment of the method according to the present invention, during the spectrum-refractive power model providing step, the model of the refractive power of at least one eye according to the spectrum parameters is determined by a method for determining a spectrum-refractive power model adapted to an individual according to the present invention.

[0022] Another object of the present invention is a method for compensating for the refractive power of an individual's eye under spectral conditions during wearing using an optical system including components configured to refract light in front of the individual's eye, the method comprising: - a refractive power determining step during which the refractive power of the individual's eye under specific spectral conditions is determined according to a method for determining the refractive power of at least one eye of an individual under specific spectral conditions according to the present invention; - an optical system providing step during which an optical system is provided, the optical system including components configured to refract light in front of the individual's eye, the components being selected according to the determined refractive power; - a refractive power compensating step during which the refractive power of the individual's eye under spectral conditions during wearing is compensated by the components of the optical system; and including.

[0023] As an advantage, the present invention can correct the axial chromatic aberration corresponding to the spectral conditions during wearing.

[0024] According to another embodiment of the method according to the present invention, during the refractive power determining step, the specific spectral conditions are very close to the spectral conditions during wearing.

[0025] Another object of the present invention is a method for selecting a color filter for an optical system adapted to an individual from a plurality of color filters, the method comprising: - a target refractive power providing step during which a target refractive power such as the individual's prescription is provided; - A spectacle lens providing step in which a spectacle lens is provided, the spectacle lens being associated with a refractive power; - A color filter providing step in which a plurality of color filters are provided, each color filter being associated with a refractive power specified according to a method for specifying the refractive power of at least one eye of an individual under specific spectral conditions according to the present invention; - A resultant refractive power specifying step in which, for each of the color filters, a refractive power obtained as a result of the association between the spectacle lens and the color filter is specified; - A refractive power difference specifying step in which, for each color filter, a difference between the resultant refractive power and a target refractive power is specified; - A color filter selecting step in which a color filter that induces a minimum difference between the resultant refractive power and the target refractive power is selected; comprising.

[0026] As an advantage, according to the present invention, a color filter adapted to an individual under specific spectral conditions can be selected.

[0027] Another object of the present invention is a system adapted to specify the refractive power of at least one eye of an individual under specific spectral conditions, the system comprising: - A light source adapted to illuminate an eye of an individual under specific spectral conditions, the specific spectral conditions being provided by a multi-color light source having a spectrum different from the spectrum of white light and / or by a color filter positioned in front of the eye of the individual and illuminated by the light source; - A refractive power specifying device adapted to specify the refractive power of an eye of an individual; comprising.

[0028] As an advantage, according to the present invention, the refractive power of at least one eye of an individual under specific spectral conditions can be specified.

[0029] Another object of the present invention is an optical system adapted to an individual, the optical system including components configured to refract light in front of the individual's eyes, and the optical system being adapted to compensate for the refractive power of the individual's eyes under spectral conditions during wearing.

[0030] Advantageously, according to the present invention, it is possible to compensate for the refractive power of the individual's eyes under spectral conditions during wearing.

[0031] Another object of the present invention is an optical system adapted to an individual, the optical system including a color filter selected from a plurality of color filters.

[0032] Advantageously, according to the present invention, it is possible to select a color filter adapted to an individual under specific spectral conditions.

[0033] Here, non-limiting embodiments of the present invention will be described by way of example only, with reference to the following drawings.

Brief Description of the Drawings

[0034]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figures 7-8

DETAILED DESCRIPTION OF THE INVENTION

[0035] The elements in the figures are shown for simplicity and clarity and are not necessarily drawn to an exact scale. For example, some dimensions of the elements in the figures may be exaggerated relative to other elements to aid in understanding the embodiments of the present invention.

[0036] The present invention relates to a method for determining the refractive power of at least one eye 2 of an individual under specific spectral conditions, as shown in FIG. 1.

[0037] In the context of the present invention, the determined refractive power refers to the change in the propagation direction of the waves of visible light passing through the eye of an individual. The determined refractive power may correspond to emmetropia or ametropia, such as myopia, hyperopia, presbyopia, astigmatism, or other eye abnormalities.

[0038] In the context of the present invention, the determined refractive power may relate to a single eye or both eyes.

[0039] In the context of the present invention, the specific spectral conditions are spectral conditions different from the CIE standard light source D65. The specific spectral conditions may include conditions related to chromaticity, such as wavelength distribution, and / or conditions related to integrated light quantity.

[0040] The method includes an eye illumination step S2 and a refractive power determination step S4.

[0041] During the eye illumination step S2, as shown in FIG. 6, at least one eye 2 of the individual is illuminated by a light source 4 under the specific spectral conditions.

[0042] The specific spectral conditions may be uniform in space and / or time. In other words, the difference between the maximum and minimum hues of the light illuminating at least one eye 2 of an individual is less than 90°, preferably less than 45°.

[0043] In a variant, the specific spectral conditions are not uniform in space and / or time. For example, such spectral conditions can be obtained by spatially reduced (point-like) and / or dynamic light sources.

[0044] The light source 4 may be a primary or secondary light source. The light source 4 may illuminate at least one eye 2 of an individual directly or indirectly, for example, by being reflected by a mirror.

[0045] The light source 4 may be a multi-color light source 6 having an emission spectrum different from that of a white light source spectrum. In this case, the specific spectral conditions relate to the emission spectrum of the multi-color light source 6.

[0046] As an advantage, a color filter is not required to generate the specific spectral conditions, and as a result, the device is simple.

[0047] The light source 4 may be generated by one or more RGB light sources, for example, by an RGB LED consisting of one red, one green, and one blue LED, or by a display monitor including such RGB LEDs.

[0048] As an advantage, the RGB light sources may be used to finely adjust the specific spectral conditions. The RGB light sources may also generate a plurality of light sources each corresponding to different specific spectral conditions, and the method of the present invention may be continuously executed for each specific spectral condition.

[0049] The multi-color light source 6 may have a spectrum in which at least one of its color coordinates x or y in the CIE xyY color space is different from the corresponding color coordinate of the blackbody locus by at least 0.01, preferably at least 0.02, and advantageously at least 0.03.

[0050] The color filter 8 may be positioned between at least one eye 2 of an individual and the light source 4. The light source 4 is, for example, a CIE standardized light source. Therefore, the light emitted by the light source 4 passes through the color filter 8, and the transmitted light illuminates the at least one eye 2 of the individual.

[0051] As an advantage, the specific spectral conditions may be obtained from any type of light source 4.

[0052] The specific spectral conditions therefore correspond to the transmission spectrum of the color filter 8 illuminated by the light source 4.

[0053] The chroma value of the color filter 8 may be calculated based on the CIE 2° standard observer under the CIE standard light source D65.

[0054] According to an embodiment of the present invention, the chroma value of the color filter 8 may be higher than or equal to 10, preferably higher than or equal to 20, more preferably higher than or equal to 30.

[0055] As an advantage, the color filter 8 transmits light having a color that is perceptibly different from white. Therefore, the spectral transmission of the filter is different from that of a neutral filter whose transmission range would be equal to 400 nm to 800 nm.

[0056] During the refractive power determination step S4, the refractive power of at least one eye 2 of the individual is determined under the specific spectral conditions.

[0057] As an advantage, according to the present invention, data related to specifying an optical system adapted to the wearer under specific spectral conditions can be specified later.

[0058] The refractive power determination step may be performed by an objective method or a subjective method.

[0059] In other words, the refractive power of at least one of the individual's eyes 2 may be specified based on measurements performed by a measuring instrument such as a skiascope or an autorefractor, which corresponds to an objective method.

[0060] As an advantage, the refractive power may be specified even when the individual cannot speak (e.g., an infant) or does not speak the language used by the practicing physician who is specifying the refractive power.

[0061] Alternatively, the refractive power of at least one of the individual's eyes 2 may be specified based on feedback provided by the individual, such as by an examination using a phoropter, which corresponds to a subjective method.

[0062] As an advantage, subjective feedback is provided regarding which setting results in the best visual field.

[0063] In a variant, or additionally, the refractive power may be specified using a two-color test or a multi-color test (color combination) in a visual acuity test or an image for optimizing the refractive power. The two-color test is a test commonly used to further examine the final stage of the refractive power, which utilizes the chromatic aberration of the eye. In fact, due to the chromatic aberration of the eye, a shorter wavelength (green) is focused in front of a longer wavelength (red). Typically, the patient is asked to compare the sharpness of the characters on the green and red sides of the panel. If the characters on the green side are sharper, a spherical power of +0.25 D is added, and if the characters on the red side are sharper, a spherical power of -0.25 D is added. With optimal spherical correction, the characters on both the red and green sides of the chart appear equally sharp. Therefore, the best refractive power is specified by adjusting the refractive power of the lens until the clarity or perceptual quality of the characters is the same between the backgrounds of red (650 nm) and green (500 nm). With the appropriate refractive power of the lens, the focus on the retina can be positioned midway between the defocusing of green / red.

[0064] As an advantage, the colors of the two-color combination are selected according to the spectrum of the filter to be evaluated or according to the light source. For example, when a yellow filter (480 nm) is selected, the two-color test is set at wavelengths of, for example, blue (420 nm) and yellow / green (540 nm), and a new refractive power is evaluated. Preferably, the color combination covers the cut filter and centering is performed thereon. The higher the range between the center and the edge of the panel, the higher the accuracy of the evaluation.

[0065] Another object of the present invention is a method for identifying a spectrum-refractive power model adapted to an individual, as shown in FIG. 2.

[0066] The method includes a specific spectrum condition providing step S6, a spectrum parameter providing step S8, a refractive power identifying step S10, and a spectrum-refractive power model identifying step S12.

[0067] During the specific spectrum condition providing step S6, a plurality of specific spectrum conditions are provided.

[0068] During the spectrum parameter providing step S8, for each of the specific spectrum conditions provided in the specific spectrum condition providing step S6, at least one spectrum parameter regarding the specific spectrum condition is provided. Such spectrum parameters may include a spectrum or a light quantity.

[0069] During the refractive power identifying step S10, the refractive power of at least one eye 2 of an individual is continuously identified for each of the specific spectrum conditions. Each identification of the refractive power of at least one eye 2 of an individual may be performed by a method including the eye illumination step S2 and the refractive power identifying step S4 according to the present invention.

[0070] During the spectrum-refractive power model identification step S12, the model of the refractive power of an individual's eye according to the spectrum parameters is identified based on each of the refractive powers of the individual's eye identified during the refractive power identification step S10 and based on each of the spectrum parameters provided during the spectrum parameter provision step S8.

[0071] As an advantage, a correspondence between each spectrum parameter and each identified refractive power is established. Thus, the model may be used to identify the refractive power based on the spectrum parameters or to identify the spectrum parameters based on the refractive power.

[0072] The model may be identified by interpolation and / or extrapolation of the refractive power of an individual's eye according to the spectrum parameters.

[0073] For example, the model is identified by regression such as least squares regression.

[0074] As an advantage, the model fits the spectrum parameters and the identified refractive powers and is extended to any specific spectrum condition within a certain range.

[0075] Another object of the present invention is a method for identifying the refractive power of at least one eye of an individual under specific spectrum conditions as shown in FIG. 3.

[0076] The method includes a spectrum parameter provision step S14, a spectrum-refractive power model provision step S16, and a refractive power identification step S18.

[0077] During the spectrum parameter provision step S14, at least one spectrum parameter regarding specific spectrum conditions is provided.

[0078] During the spectrum-refractive power model provision step S16, a model of the refractive power of at least one eye according to spectrum parameters such as spectrum or light quantity is provided.

[0079] The model may be pre-specified by the method according to the present invention described above, including a specific spectrum condition providing step S6, a spectrum parameter providing step S8, a refractive power specifying step S10, and a spectrum-refractive power model specifying step S12.

[0080] The model may be general-purpose or specific to a certain category of an individual or individuals. In the context of the present invention, a category of people is, for example, a category of age or visual acuity.

[0081] A plurality of specific models may be provided.

[0082] As an advantage, when the refractive power of an individual's eye is specified a sufficient number of times to establish a model, according to the present invention, without measuring any other refractive powers such as the refractive power of the same eye under different spectrum conditions or the refractive powers of the eyes of a number of people belonging to the same category under any specific conditions, it becomes possible to quickly specify.

[0083] As an example, the model is a mathematical model. The model is specified, for example, using an extreme filter (e.g., a low-pass band (500 nm) and a high-pass band (600 nm) filter). The defocus amount due to refraction is obtained through the following expression:

Number

Number

Number

[0084] As an alternative to equation (1), for defocus amounts D i (λ i ) that are known, and for the transmittance T i (λ i ) of the filter that the wearer places on the lens that are also known, the defocus amount necessary to compensate for the defocus of the filter can be calculated using the following expression: [Number] Where: · D final is the defocus amount due to the final refraction. · D i is the defocus amount induced by the wavelength λ i . · T i is the transmittance of the lens with respect to λ i . · λ i is the wavelength expressed in nanometers and is 400 nm to 800 nm. · N is greater than 5.

[0085] The model may also include a luminance component since the defocus amount also depends on luminance. Thus, for example, three different models, namely one for the dark level, one for the twilight level, and one for the bright level, can be used.

[0086] It is also possible to use two or more different models, each of which is adapted to a different bright vision luminance level. Such examples of luminance levels may correspond to different ranges of luminance heights, for example, to different ranges of luminance heights less than and greater than 1 cd / m 2 respectively, or to different ranges of luminance heights less than and greater than 0.1 cd / m 2Less than dark, i.e., low light, 0.1 cd / m 2 exceeding, 10 cd / m 2 less than low bright light, and bright light exceeding 10 cd / m 2 may be referred to as.

[0087] Age and refractive abnormalities may also be included in such a model.

[0088] During the refractive power determination step S18, the refractive power of an individual's eye under specific spectral conditions is determined based on the provided model and based on the provided spectral parameters.

[0089] The method of the present invention may further include an individual parameter providing step S15, during which individual parameters related to the individual, such as the individual's age or those related to their eyesight, are provided.

[0090] In an embodiment, the method further includes a model selection step S17, during which a specific spectral-refractive power model is selected from among a plurality of provided models. Then, during the refractive power determination step S18, the refractive power of the individual's eye is determined based on the selected model. The selection of the model may be based on the provided individual parameters and / or based on the spectral parameters.

[0091] As an advantage, a model that best fits the individual and / or the spectral conditions of interest is selected.

[0092] Another object of the present invention is a method of compensating for the refractive power of an individual's eye under spectral conditions during wearing, with an optical system including at least one component configured to refract light in front of the individual's eye, as shown in FIG. 4.

[0093] As an advantage, according to the present invention, the refractive power of an individual's eye under spectral conditions during wearing can be compensated. Thus, an optical system adapted to the individual under spectral conditions during wearing can be provided.

[0094] The component may include a color filter. The color filter may be monochromatic or multi-color. The optical filter may be active or passive. The optical filter may be uniform or may have a gradient.

[0095] For example, the spectrum of the optical filter is measured using a spectrophotometer equipped with a full-spectrum xenon light source and a monochromator that measures light in at least the visible range (e.g., 400 nm to 800 nm).

[0096] The component may include an optical lens.

[0097] The method includes a refractive power determination step S20, an optical system providing step S22, and a refractive power compensation step S24.

[0098] During the refractive power determination step S20, the refractive power of an individual's eye under specific spectral conditions is determined by a certain method.

[0099] The method for determining the refractive power of at least one eye of an individual under specific spectral conditions may be the method according to the present invention including an eye illumination step S2 and a refractive power determination step S4.

[0100] The method for determining the refractive power of at least one eye of an individual under specific spectral conditions may be the method according to the present invention including a spectral parameter providing step S14, a spectrum-refractive power model providing step S16, and a refractive power determination step S18.

[0101] The specific spectral conditions may be very close to the spectral conditions during wearing.

[0102] During the optical system providing step S22, an optical system is provided. The optical system includes one or more components configured to refract light in front of an individual's eye.

[0103] The components are selected according to the determined refractive power.

[0104] Each component may be active or passive.

[0105] Active components are particularly advantageous in that they may be programmed to compensate for spectral conditions during wear that may vary over time.

[0106] During the refractive power compensation step S24, the refractive power of the individual's eye under the spectral conditions during wear is compensated by the components of the optical system.

[0107] As an example, the refractive power of the wearer's lens is adjusted according to filter parameters (transmittance and spectrum) selected by the wearer. For example, consider an individual with a myopia correction prescription of -2.00D for one eye to obtain a visual acuity of 0 log, also known as 10 / 10 visual acuity. Further, the individual selects glasses with a brown filter having a transmittance of 18%. The combination of the lens and the brown filter induces a loss of visual acuity, and the visual acuity becomes 0.1 log (8 / 10). When the refractive power determination step is performed using the same filter under high luminance conditions exceeding 100 cd / m 2 In this example, during the refractive power compensation step, the refractive power of this individual's eye under the spectral conditions during wear is compensated by the brown filter associated with the lens, with a final sun filter prescription of -1.75D.

[0108] Another object of the present invention is a method for selecting a color filter for an optical system adapted to an individual from among a plurality of color filters, as shown in FIG. 5.

[0109] The method includes a target refractive power providing step S26, an ophthalmic lens providing step S28, a color filter providing step S30, a resultant refractive power determining step S32, a refractive power difference determining step S34, and a color filter selecting step S36.

[0110] During the target refractive power providing step S26, the target refractive power such as an individual's prescription is provided. In an embodiment, the target refractive power may correspond to emmetropia.

[0111] During the ophthalmic lens providing step S28, an ophthalmic lens is provided. The ophthalmic lens is associated with the refractive power.

[0112] During the color filter providing step S30, a plurality of color filters are provided.

[0113] Each color filter is associated with the refractive power. The refractive power may be previously specified by a method for specifying the refractive power of at least one eye of an individual under specific spectral conditions.

[0114] The method for specifying the refractive power of at least one eye of an individual under specific spectral conditions may be the method according to the present invention including the eye illumination step S2 and the refractive power specifying step S4 described herein.

[0115] The method for specifying the refractive power of at least one eye of an individual under specific spectral conditions may be the method according to the present invention including the spectral parameter providing step S14, the spectrum-refractive power model providing step S16, and the refractive power specifying step S18.

[0116] During the resultant refractive power specifying step S32, for each of the color filters, the refractive power as a result of the association of the ophthalmic lens and the color filter is specified.

[0117] During the refractive power difference specifying step S34, the difference between the resultant refractive power and the target refractive power is specified for each color filter.

[0118] During the color filter selection step S36, the color filter that induces the minimum difference between the resultant refractive power and the target refractive power is selected.

[0119] As an advantage, the selected color filter induces specific spectral conditions that contribute to adapting the refractive power to reach the target refractive power. Thus, since the target refractive power is not reached only by the curvature of the ophthalmic lens, the present invention makes the manufacture of ophthalmic lenses more flexible.

[0120] As an example, the refractive aberration induced by the filter is used to correct the optical effect. For example, myopia can be observed at night. To compensate for this myopia, a filter that cuts low / mid wavelengths may be used. If the prescription for an individual's single eye corresponds to +3.00D in a clear lens and myopia of -0.25D is induced by low-light conditions, a new device with a lens having a spherical power of +3.00D associated with a specific filter that cuts low and mid wavelengths, for example, a brown filter that induces a +0.25D shift, may be proposed to compensate for the myopia. Another application is to adapt the filter to compensate for the presbyopia effect. In the early stages of presbyopia, usually around 45 years old, people usually need glasses with a small refractive power, either single-focus or progressive lenses, to compensate for the loss of accommodation. According to the innovation of the present application, alternatively, it is proposed to adjust a filter, for example, attached to a removable clip adjustable according to the frame. The filter may be a low-pass band filter that cuts high wavelengths in order to shift the image on the retina to obtain the best vision. If the wearer's prescription includes, for example, an addition of 1.25D, a low-pass band filter such as a passband of 500 nm may be applied to shift the refractive power to -1.25D at a luminance level of 10 cd / m 2 and correct optimally at low cost and very quickly. This application is particularly beneficial in countries where access to visual care is difficult.

[0121] In other examples, the addition of a filter (low-pass band) makes it possible to complete the conventional optical addition by adding this filter and a small magnification for certain close-up work (precision activities such as DIY, sewing, computer work, etc.). Elderly or presbyopic people wear an addition power to compensate for the presbyopic effect (e.g., at a distance of about 40 cm). For closer distances (certain activities that require more concentration), a stronger power addition has to be worn. Instead of a new instrument, a specific filter can be added to compensate for this additional refractive power. Similar to the previous example, by adding a low-pass band filter, the loss of accommodation power at close range can be compensated. To identify the best filter, use a logical model as described above or perform a new refractive power identification step using filters with different spectra under specific conditions (working distance, light conditions, etc.) selected by the wearer to identify a suitable filter that can reduce the accommodation load. The advantage of using a filter instead of adjusting the power of the lens is to maintain the original working distance. In fact, by adding a new optical refractive power, the wearer would have to shorten their working distance.

[0122] Electronic or electrochromic spectacle lenses can not only adjust the power of the lens, but also filter the color of the lens. Thanks to sensors incorporated in the frame, by analyzing light conditions, working distance, the wearer's fatigue (e.g., eyelid analysis), etc., and from the wearer's initial refractive power profile (refractive power, age, pupil behavior, lifestyle, etc.), the optical lens according to the invention adjusts the initial refractive power by adjusting the power and / or the color filter, and improves visual performance (visual acuity, contrast, accommodation load). The choice of power or filter adjustment may be specified, for example, according to aesthetic criteria or the comfort of the working distance.

[0123] For example, consider an individual who has the same prescription with the same addition power of +2.00 under the standard spectrum condition of +2.50D for both eyes. In this example, this individual is 50 years old. Their favorite activities are golfing outdoors, activities using a laptop for work, and collecting stamps on weekends. When golfing, they wear sun lenses (brown class 3). To maintain the optimal contrast and visual performance for this activity, an optometrist or optician realizes a new refractive power specification under spectral conditions corresponding to a light source with a high luminance (exceeding 100 cd / m 2 that illuminates the color filter of the selected sun lens. In this example, a shift of +0.25D is observed, the visual acuity becomes 0.05 log higher, and the contrast is improved by 10%. The final refractive power prescription for this person's sunglasses may therefore be adjusted to correspond to +2.75D for distance vision. For near vision (stamp collecting), this individual requires a more accurate visual performance than that provided by the progressive lenses currently in use. To improve comfort, this wearer requires an addition power 0.75D higher. To solve this problem, the wearer may adjust the filter to improve the contrast while maintaining an ergonomic distance. The proposed filter may be a removable filter such as a clip, or may correspond to the color configuration of an electrochromic lens. To identify the appropriate characteristics of the filter, several low-pass band filters with different cut-off values may be tested to identify the corresponding refractive power for each filter. Then, according to this example, the filter that provides the shift closest to the required shift of +0.75D will be selected and provided to this wearer.

[0124] Another object of the present invention is a system 10 adapted to identify the refractive power of at least one eye 2 of an individual under specific spectral conditions. The system 10 includes a light source 4 adapted to illuminate the eye 2 of the individual under specific spectral conditions, as shown in FIG. 6. The system 10 also includes a refractive power identification device 12 adapted to identify the refractive power of the eye 2 of the individual.

[0125] Specific spectral conditions may be provided by a multi - color light source 6 having a spectrum different from that of white light and / or by a color filter 8 positioned in front of an individual's eye 2.

[0126] According to another embodiment of the system according to the invention, the system 10 is adapted to determine the refractive power of at least one eye 2 of an individual under specific spectral conditions by a method for determining the refractive power of at least one eye of an individual under specific spectral conditions according to the invention, the method including an eye illumination step S2 and a refractive power determination step S4.

[0127] Another object of the present invention is an optical system 20 adapted to an individual as shown in FIG. 7. The optical system 20 includes a component 22 configured to refract light in front of an individual's eye. The optical system 20 is adapted to compensate for the refractive power of an individual's eye 2 under spectral conditions during wearing. The component 22 is selected according to the refractive power, and the refractive power is determined by a method for determining the refractive power of at least one eye of an individual under specific spectral conditions according to the invention.

[0128] In an embodiment, the method for determining the refractive power of at least one eye of an individual under specific spectral conditions is the method according to the invention including an eye illumination step S2 and a refractive power determination step S4.

[0129] In an embodiment, the method for determining the refractive power of at least one eye of an individual under specific spectral conditions is the method according to the invention including a spectral parameter providing step S14, a spectrum - refractive power model providing step S16, and a refractive power determination step S18.

[0130] Another object of the present invention is an optical system 30 adapted to an individual as shown in FIG. 8. The optical system 30 includes a color filter 32 selected from a plurality of color filters. The color filter 32 is selected by a method for selecting a color filter for an optical system adapted to an individual from a plurality of color filters according to the invention.

[0131] As described above, the present invention has been described using embodiments, but the general inventive concept is not limited.

[0132] Those skilled in the art, referring to the above exemplary embodiments which are only presented as examples and do not limit the scope of the present invention which is only specified by the appended claims, will envision many other improvements and modifications.

[0133] In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plural form. Just because different features are described in different dependent claims does not mean that combinations of these features cannot be used advantageously. Any reference signs in the claims should not be construed as limiting the scope of the invention.

Claims

1. A method for determining the refractive power of at least one eye of an individual under specific spectral conditions, comprising: - an eye illumination step in which the at least one eye of the individual is illuminated under the specific spectral conditions, the specific spectral conditions being provided by a multi-color light source having a spectrum different from that of a white light source and / or by a color filter positioned in front of the at least one eye of the individual and illuminated by a light source; - a refractive power determination step in which the refractive power of the at least one eye of the individual is determined under the specific spectral conditions, the refractive power determination step measuring the refractive power error of the wearer under the specific spectral conditions; A method comprising the above steps.

2. During the eye illumination step, the at least one eye of the individual is illuminated under the specific spectral conditions, the specific spectral conditions being provided by a multi-color light source having a spectrum different from that of a white light source, wherein at least one of the color coordinates x or y of the multi-color light source in the CIE xyY color space is at least 0.01 different from the color coordinates of the blackbody locus corresponding to the color coordinates x or y in the CIE xyY color space. The method according to claim 1.

3. A method for determining a spectrum-refractive power model adapted to an individual, comprising: - a specific spectral condition providing step in which a plurality of specific spectral conditions are provided; - a spectral parameter providing step in which, for each of the specific spectral conditions, at least one spectral parameter related to the specific spectral condition is provided; - the refractive power determination step in the method according to claim 1 or 2, in which the refractive power of the at least one eye of the individual is continuously determined for each of the specific spectral conditions; - a spectral-refractive power model identification step in which a model of the refractive power of at least one eye of the individual as a function of the spectral parameters is identified based on each of the refractive powers of at least one eye of the individual and each of the spectral parameters; A method comprising.

4. The method according to claim 3, wherein during the spectral-refractive power model identification step, the model is identified by interpolation and / or extrapolation of the refractive power of at least one eye of the individual as a function of the spectral parameters.

5. A method for identifying the refractive power of at least one eye of an individual under specific spectral conditions, comprising: - a specific spectral condition providing step in which a plurality of specific spectral conditions are provided; - for each of the specific spectral conditions, a spectral parameter providing step in which at least one spectral parameter related to the specific spectral condition is provided; - for each of the specific spectral conditions, a refractive power identifying step in which the refractive power of at least one eye of the individual is continuously identified according to a method for identifying the refractive power of at least one eye of the individual under the specific spectral conditions, the method comprising: · an eye illumination step in which at least one eye of the individual is illuminated under the specific spectral conditions, the specific spectral conditions being provided by a multi-color light source having a spectrum different from that of a white color spectrum and / or by a color filter positioned in front of at least one eye of the individual and illuminated by a light source; · a refractive power identifying step in which the refractive power of at least one eye of the individual is identified under the specific spectral conditions; including the steps; - A spectrum-refractive power model of at least one eye of the individual as a function of the spectral parameters, the spectrum-refractive power model being specified based on each of the refractive powers of at least one eye of the individual and each of the spectral parameters, a spectrum-refractive power model specifying step; - A spectrum-refractive power model providing step of providing the spectrum-refractive power model of at least one eye of the individual as a function of the spectral parameters, the spectrum-refractive power model being specified based on each of the refractive powers of at least one eye of the individual and each of the spectral parameters; - A spectral parameter providing step of providing at least one spectral parameter regarding a specific spectral condition of the individual; - A refractive power specifying step of specifying the refractive power of at least one eye of the individual under a specific light condition based on the model and the at least one spectral parameter; A method comprising the above.

6. A system configured to specify the refractive power of at least one eye of an individual under a specific spectral condition, - A light source configured to illuminate at least one eye of the individual under a specific spectral condition, the specific spectral condition being provided by a multi-color light source having a spectrum different from that of white light and / or by a color filter positioned in front of at least one eye of the individual and illuminated by the light source; - A refractive power specifying device configured to specify the refractive power of at least one eye of the individual, the refractive power specifying device measuring a refractive power error of the wearer under the specific spectral condition; A system comprising the above.

Images