CN111419169A

CN111419169A - Method for acquiring eye response

Info

Publication number: CN111419169A
Application number: CN202010262357.2A
Authority: CN
Inventors: 陈善球; 李超宏; 李磊
Original assignee: Suzhou Microclear Medical Instruments Co ltd
Current assignee: Suzhou Microclear Medical Instruments Co ltd
Priority date: 2020-04-06
Filing date: 2020-04-06
Publication date: 2020-07-17

Abstract

The invention provides a method for acquiring eye response, which comprises the following steps: emitting illumination of at least two off-axis lamps in an eye direction; the connecting line of the at least two off-axis lamps is coplanar with the optical axis of the imaging assembly, and the at least two off-axis lamps are positioned on the same side of the optical axis; the imaging assembly acquires an image of a pupil of the illuminated eye. Compared with the prior art, the method for acquiring the eye response can effectively reduce the time for acquiring the pupil image data and effectively reduce the data processing amount, thereby greatly shortening the time for screening the eyesight and effectively improving the use experience of a user.

Description

Method for acquiring eye response

Technical Field

The invention relates to the technical field of vision screening, in particular to a method for obtaining eye response by irradiating eyes with light.

Background

The optometry is the golden standard for ametropia examination, and the accuracy can reach +/-0.25D. However, for children, optometry has its limitations of application. The hand-held vision screening instrument is an instrument specially designed and produced for infant vision screening in recent years. The method is characterized in that: the detection can be performed under the condition of keeping a certain distance from the detected person, and the detected person does not need to have high matching performance. This characteristics make hand-held type eyesight examination appearance not only be applicable to the crowd that the combining ability is strong, be applicable to infant and children and the crowd that the combining ability is poor moreover.

The handheld vision screening instrument projects infrared light sources to retinas, light reflected back through the retinas presents different patterns in different refraction states, and a camera records pupil patterns and obtains data such as a sphere lens, a cylinder lens, an axis and the like through calculation. The system can obtain information such as the refractive states, pupil diameters, pupil distances, eye positions and the like of two eyes through one-time measurement, and is convenient for doctors to quickly screen and comprehensively know the vision development conditions of patients.

However, the relationship between the gradient of the pupil image and the diopter of the eye is not a monotonic function. Referring to fig. 1, the abscissa represents diopter and the ordinate represents the gradient of the pupil image. As the diopter increases, the gradient of the corresponding pupil image is first rising and then falling. For the same diopter, when the light intensity of the infrared light source is larger, the gradient of the pupil image is larger, which also means that the resolution of the diopter is higher. However, the larger the light intensity is, the smaller the corresponding monotone rising section is. In order to distinguish whether the diopter corresponding to the gradient A is D1 or D2, pupil images corresponding to two light intensities need to be shot. The range of ametropia of the human eye is usually in the range of-8D to 8D. In order to enable the testing range of the handheld vision screening instrument to cover a range from-8D to 8D, 4 to 6 infrared lamps are usually required to be arranged, pupil images corresponding to the infrared lamps are shot, and diopter is determined according to the pupil images. So set up, not only make the time of eyesight screening longer, also make data processing volume great moreover, further prolonged the time of eyesight screening, and then reduced user's use experience.

In view of the above problems, there is a need to provide a new method for obtaining an ocular response to solve the above problems.

Disclosure of Invention

The invention aims to provide a method for acquiring eye response, which can effectively reduce the time for acquiring pupil image data and the data processing amount, thereby greatly shortening the time for screening eyesight and effectively improving the use experience of users.

To achieve the above object, the present invention provides a method for obtaining an ocular response, comprising the steps of: emitting illumination of at least two off-axis lamps in an eye direction; the connecting line of the at least two off-axis lamps is coplanar with the optical axis of the imaging assembly, and the at least two off-axis lamps are positioned on the same side of the optical axis; the imaging assembly acquires an image of a pupil of the illuminated eye.

As a further development of the invention, the at least two off-axis lamps differ in luminous intensity.

As a further improvement of the invention, the at least two off-axis lamps have a decreasing luminous intensity from off-axis lamps further from the optical axis to off-axis lamps closer to the optical axis.

As a further improvement of the invention, the luminous intensity of the at least two off-axis lamps is gradually increased from the off-axis lamp far away from the optical axis to the off-axis lamp close to the optical axis.

As a further improvement of the invention, the spacing between two adjacent off-axis lamps is no more than 20 mm.

As a further improvement of the invention, the diameter of the off-axis lamp is D, and the distance between two adjacent off-axis lamps is 0.5D-2D.

As a further development of the invention, the illumination of a coaxial lamp is emitted in the direction of the eye, the coaxial lamp or the illumination light emitted by the coaxial lamp being located on the optical axis of the imaging assembly.

As a further improvement of the invention, at least one of the at least two off-axis lamps has a luminous intensity greater than that of the on-axis lamp.

As a further improvement of the invention, the distance between the on-axis lamp and the adjacent off-axis lamp is 20 mm-50 mm.

As a further improvement of the invention, the light-emitting time of the off-axis lamp is between 3 milliseconds and 100 milliseconds.

The invention has the beneficial effects that: the method for acquiring the eye response can effectively reduce the time for acquiring the pupil image data and the data processing amount, thereby greatly shortening the time for screening the eyesight and effectively improving the use experience of users.

Drawings

Fig. 1 is a diagram illustrating a relationship curve between diopter and pupil image gradient.

Fig. 2 is a schematic flow chart of a method for obtaining an ocular response according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 2, the present invention discloses a method for obtaining an eye response, comprising the following steps: s1: emitting illumination of at least two off-axis lamps in an eye direction; the connecting line of the at least two off-axis lamps is coplanar with the optical axis of the imaging assembly, and the at least two off-axis lamps are positioned on the same side of the optical axis; s2: the imaging assembly acquires an image of a pupil of the illuminated eye.

Because the at least two off-axis lamps simultaneously irradiate the eyes, the gradient and diopter relation curves corresponding to the at least two off-axis lamps are similar to the superposition of the gradient and diopter relation curves corresponding to a single off-axis lamp, and the monotone ascending interval of the gradient and diopter relation curves is effectively lengthened. By the arrangement, when the eyesight is screened, the diopter within the range of-8D to 8D can be determined only by lighting the off-axis lamp twice and shooting two corresponding pupil images simultaneously, so that the time for acquiring the pupil image data is effectively reduced, the data processing capacity is effectively reduced, the time for screening the eyesight is greatly shortened, and the use experience of a user is effectively improved.

Preferably, the at least two off-axis lamps differ in luminous intensity. The luminous intensity of the at least two off-axis lamps is gradually weakened from the off-axis lamp far away from the optical axis to the off-axis lamp close to the optical axis. Of course, in other embodiments, it can also be configured as: the luminous intensity of the at least two off-axis lamps is gradually increased from the off-axis lamp far away from the optical axis to the off-axis lamp close to the optical axis.

Preferably, the spacing between two adjacent off-axis lamps is no greater than 20 mm. Preferably, the diameter of the off-axis lamp is D, and the distance between two adjacent off-axis lamps is 0.2D-2D. So set up, can reduce the size of light array when not reducing the illuminating effect, not influencing the eyesight screening effect to be convenient for further miniaturized handheld eyesight screening appearance.

Preferably, the step S1 further includes: emitting illumination of a coaxial lamp in the direction of the eye, the coaxial lamp or illumination light emitted by the coaxial lamp being located on the optical axis of the imaging assembly. By the arrangement, accurate fitting of the marginal data of the pupil in the pupil image processing process is facilitated, and the diopter calculation precision according to the pupil image is effectively improved.

Preferably, the luminous intensity of at least one of the at least two off-axis lamps is greater than the luminous intensity of the on-axis lamp. Preferably, the luminous intensity of the at least two off-axis lamps is greater than the luminous intensity of the on-axis lamp. So set up, not only be convenient for at the marginal data of pupil image processing in-process accurate fitting pupil, can effectively reduce the influence that coaxial lamp calculated to diopter moreover.

Preferably, the distance between the on-axis lamp and the adjacent off-axis lamp is 20 mm to 50 mm. So set up, be convenient for from the light entering imaging assembly of pupil return from the clearance between on-axis lamp and the off-axis lamp to make imaging assembly can acquire sufficient formation of image light.

Preferably, the off-axis lamp has a light emission time between 3 milliseconds and 100 milliseconds. So set up, can effectively compress the required time of eyesight screening under the demand that satisfies the formation of image subassembly and acquire the formation of image light to can effectively promote user's use and experience.

Compared with the prior art, the method for acquiring the eye response can effectively reduce the time for acquiring the pupil image data and effectively reduce the data processing amount, thereby greatly shortening the time for screening the eyesight and effectively improving the use experience of a user.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.

Claims

1. A method of obtaining an ocular response comprising the steps of:

emitting illumination of at least two off-axis lamps in an eye direction; the connecting line of the at least two off-axis lamps is coplanar with the optical axis of the imaging assembly, and the at least two off-axis lamps are positioned on the same side of the optical axis;

the imaging assembly acquires an image of a pupil of the illuminated eye.

2. The method of obtaining an ocular response of claim 1, wherein: the at least two off-axis lamps have different luminous intensities.

3. The method of obtaining an ocular response of claim 1, wherein: the luminous intensity of the at least two off-axis lamps is gradually weakened from the off-axis lamp far away from the optical axis to the off-axis lamp close to the optical axis.

4. The method of obtaining an ocular response of claim 1, wherein: the luminous intensity of the at least two off-axis lamps is gradually increased from the off-axis lamp far away from the optical axis to the off-axis lamp close to the optical axis.

5. The method of obtaining an ocular response of claim 1, wherein: the spacing between two adjacent off-axis lamps is no more than 20 mm.

6. The method of obtaining an ocular response of claim 1, wherein: the diameter of each off-axis lamp is D, and the distance between every two adjacent off-axis lamps is 0.5D-2D.

7. The method of obtaining an ocular response of any of claims 1-6, wherein: emitting illumination of a coaxial lamp in the direction of the eye, the coaxial lamp or illumination light emitted by the coaxial lamp being located on the optical axis of the imaging assembly.

8. The method of obtaining an ocular response of claim 7, wherein: the luminous intensity of at least one off-axis lamp of the at least two off-axis lamps is larger than that of the on-axis lamp.

9. The method of obtaining an ocular response of claim 7, wherein: the distance between the coaxial lamp and the adjacent off-axis lamp is 20 mm-50 mm.

10. The method of obtaining an ocular response of any of claims 1-6, wherein: the light emitting time of the off-axis lamp is between 3 milliseconds and 100 milliseconds.