A device for distinguishing properties of a gaze

Abstract

The utility model discloses a kind of equipment distinguishing fixation nature, including shell, the top of shell is equipped with fixed structure, the inside of shell is equipped with black dot generating device, combination mirror is equipped on black dot generating device, the upper end of black dot generating device is equipped with half lens, half lens is inclined, while the left end of shell is equipped with silica gel eyecup and convex lens, fixed structure is used to fix the center mark plate, while the center mark plate is equipped with center alignment device and alignment device light source, light source radiator is equipped in shell, the outside of shell is equipped with control key and card reader, combination mirror is filter and homogenization combination mirror.This application has the advantages of low cost, low false positive rate, pupil dilation free etc..

Description

Technical Field

[0001] This utility model relates to the field of vision testing, specifically a device for distinguishing the nature of gaze. Background Technology

[0002] Currently, there are three main methods for examining fixation in clinical practice: direct ophthalmoscopy, Kappa angle method, and microperimeter method.

[0003] The advantages of direct ophthalmoscope examination for fixational characteristics are: ease of operation (the doctor simply holds the ophthalmoscope and focuses it on the patient's fundus, and the patient cooperates with the observation); strong intuitiveness (the location of the macula can be directly observed through the ophthalmoscope, thus determining the nature of fixation); and wide applicability (this method is suitable for patients of all ages, especially children, due to its simplicity and high patient cooperation).

[0004] The disadvantages are: It is affected by the Kappa angle (the angle between the visual axis and the optical axis), which can affect the judgment of fixation characteristics and may lead to misjudgment. It requires patient cooperation; close cooperation from the patient is necessary during the examination, especially for children, whose limited expressive abilities may affect the accuracy of the results. It cannot quantify the degree of eccentricity: Direct ophthalmoscopy can only roughly estimate the degree of eccentric fixation and cannot provide precise quantitative data.

[0005] The advantages of the Kappa angle method for determining fixation type are its simplicity and ease of use. This method involves having the patient fixate on a point light source and observing the position of the light reflection on the cornea to roughly determine the nature of fixation. Parents can perform this at home, making it suitable for initial screening. It is also low-cost: no complex equipment is required, only a point light source is needed for the test. However, its disadvantages include poor accuracy: the Kappa angle method itself is inaccurate and easily affected by the Kappa angle. The Kappa angle is the angle between the visual axis and the optical axis; the different positions of the light reflection at the center of the pupil can mislead the results. It is highly misleading: due to the influence of the Kappa angle, a light reflection on the "nasal side" of the pupil center may be misinterpreted as a positive Kappa angle, while on the "temporal side" it may be misinterpreted as a negative Kappa angle. This method can lead to incorrect conclusions and may mislead parents and doctors. It is not suitable for all situations; for example, this method cannot provide accurate conclusions for patients with macular ectopia. Furthermore, comparing the difference in Kappa angles between the two eyes cannot accurately determine the nature of fixation.

[0006] The advantages of microperimeter in fixation testing include high accuracy. By having the patient judge and input optotypes on the examination screen from a fixed distance, microperimeter can accurately mark the visual perception levels of different areas on the retina. By comparing real-time fundus imaging with computer algorithms, the fixation nature of the examined eye can be determined relatively accurately. Intuitive image output: The intuitive image output of microperimeter makes the examination results more intuitive and easier to understand, which helps doctors make more accurate diagnoses. With technological advancements, microperimeter is likely to become a standard tool for fixation testing in large strabismus and amblyopia clinics for a considerable period, demonstrating its importance and promising application prospects in this field.

[0007] The disadvantages are: The equipment is expensive: Microperimeters are relatively new ophthalmic examination devices, and even in top-tier teaching hospitals, many ophthalmology departments still lack this equipment, indicating limited availability. Operation is complex: Using a microperimeter requires specialized operating skills and familiarity with the device, which may be a challenge for some primary healthcare institutions. The false positive rate is high: The method of determining fixation by judging corneal reflection points using a penlight is susceptible to interference from factors such as patient eye position and Kappa angle, resulting in a high false positive rate.

[0008] The existing alternative method is the Haidinger brush, but it can only make qualitative judgments and cannot provide quantitative data. It is also greatly affected by subjective factors, and the results may not be accurate enough.

[0009] In conclusion, differentiating fixation characteristics has positive clinical significance, especially in the screening and monitoring of children with amblyopia. However, there is currently a lack of simple, easy-to-operate, and objective methods for assessing amblyopia treatment. Utility Model Content

[0010] Therefore, the purpose of this invention is to provide a device for distinguishing the nature of gaze in order to solve the above-mentioned problems.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a device for distinguishing the nature of gaze, comprising a housing, a fixed structure at the top of the housing, a black dot generating device inside the housing, a combination mirror on the black dot generating device, a semi-transparent lens at the upper end of the black dot generating device, the semi-transparent lens being inclined, and a silicone eye mask and a convex lens at the left end of the housing.

[0012] Furthermore, the fixing structure is used to fix the center marker plate, and the center marker plate is equipped with a center alignment device and an alignment device light source.

[0013] Furthermore, a heat sink for the light source is installed inside the casing.

[0014] Furthermore, the exterior of the casing features control keys and a card reader.

[0015] Furthermore, the combination lens is a combination of a filter and a homogenizer.

[0016] In summary, the present invention has the following main advantages:

[0017] It can generate protective shadows of different sizes corresponding to different zones of the macula, thereby achieving zonal inhibition of visual cells; by using zonal inhibition to determine the relative position of the fixation point and the center of the macula, the examination process is simplified; and pupil dilation can be avoided during the examination. It has the advantages of low cost, low false positive rate, and no pupil dilation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0019] In the diagram: 1-Outer shell; 2-Semi-transparent lens; 3-Fixed structure; 4-Center marker plate; 5-Center alignment device; 6-Alignment device light source; 7-Card reader; 8-Silicone eye mask; 9-Convex lens; 10-Black dot generation device; 11-Combination lens; 12-Light source; 13-Light source heat sink; 14-Control key; 15-Eyeball model; 16-Pupil; 17-Retina. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] The embodiments of this utility model will be described below based on its overall structure.

[0022] See Figure 1 A device for distinguishing gaze characteristics includes a housing 1, a fixing structure 3 at the top of the housing 1, a black dot generating device 10 inside the housing 1, a combination lens 11 on the black dot generating device 10, a semi-transparent lens 2 at the upper end of the black dot generating device 10, the semi-transparent lens 2 being tilted, and a silicone eye patch 8 and a convex lens 9 at the left end of the housing 1. The optical path distance between the center marker plate 4 and the black dot generating device 10 and the convex lens 9 is greater than or equal to the focal length of the convex lens 9, and the optical path distance between the center marker plate 4 and the convex lens 9 is less than or equal to the black dot generating device 10.

[0023] Furthermore, the fixing structure 3 is used to fix the center marker plate 4, and the center marker plate 4 is provided with a center alignment device 5 and an alignment device light source 6. The center alignment device 5 and the alignment device light source 6 generate signals specifically recognized by the central cone cells of the retinal macular region, such as a light brush or blue light. Preferably, blue circles that decrease in size from large to small are generated periodically, and their centers are coaxial with the center of the center marker plate 4.

[0024] Furthermore, a light source heat sink 13 is provided inside the outer casing 1.

[0025] Furthermore, the exterior of the housing 1 is equipped with control keys 14 and a card reader 7.

[0026] Furthermore, the combination mirror 11 is a combination mirror for filtering and homogenizing light, and its function is to filter harmful wavelengths in the light source.

[0027] The black dot generating device 10 and the light source produce a light spot with an intermediate shadow. Preferably, the light source is a planar light source with adjustable brightness, such as an LED planar light source. The size of the shadow created by the black dot generating device 10 is determined. This device uses an electrically controlled glass support. A liquid crystal film with a switching function is laminated between two pieces of glass. Utilizing the characteristics of the liquid crystal, the power supply is controlled, causing the glass to switch instantaneously from transparent to opaque or vice versa. Nine concentric circles are pre-fabricated in the center of the disc, with circle 1 having a radius of 0.5mm, circle 2 having a radius of 1.0mm, circle 3 having a radius of 1.5mm, and so on. Each circle can be individually controlled to be transparent or opaque. The size is automatically or manually controlled via circuitry, an MCU, etc., to create black dots with diameters of 1–5mm, thus generating shadows in the light path. Alternatively, the black dot generating device 10 can be used to generate multiple black dots of different diameters by screen printing with a mechanical dial (as described in other patent documents published by the applicant).

[0028] In summary, the working principle of this application is as follows: the device emits strong light to illuminate the retina, producing circular shadow areas of different sizes centered on the macula. If the gaze point is outside the shadow, it is suppressed; otherwise, normal vision occurs. This device utilizes this principle to determine the relative relationship between the eye's gaze center and the retinal center (macula center) through sequential illumination.

[0029] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A device for distinguishing gaze characteristics, comprising a housing (1), characterized in that: The top of the outer shell (1) is provided with a fixing structure (3), the inside of the outer shell (1) is provided with a black spot generating device (10), the black spot generating device (10) is provided with a combination mirror (11), the upper end of the black spot generating device (10) is provided with a semi-transparent lens (2), the semi-transparent lens (2) is tilted, and the left end of the outer shell (1) is provided with a silicone eye mask (8) and a convex lens (9).

2. The device for distinguishing gaze characteristics according to claim 1, characterized in that: The fixing structure (3) is used to fix the center marking plate (4), and the center marking plate (4) is equipped with a center alignment device (5) and an alignment device light source (6).

3. The device for distinguishing gaze characteristics according to claim 1, characterized in that: The outer casing (1) contains a heat sink (13) for the light source.

4. The device for distinguishing gaze characteristics according to claim 1, characterized in that: The outer casing (1) is equipped with control keys (14) and a card reader (7).

5. A device for distinguishing gaze characteristics according to claim 1, characterized in that: The combination mirror (11) is a combination mirror for filtering and homogenizing light (11).

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