CN107647845B - Model eye for fundus detection and application method thereof - Google Patents
Model eye for fundus detection and application method thereof Download PDFInfo
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- CN107647845B CN107647845B CN201711032818.1A CN201711032818A CN107647845B CN 107647845 B CN107647845 B CN 107647845B CN 201711032818 A CN201711032818 A CN 201711032818A CN 107647845 B CN107647845 B CN 107647845B
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- lens
- fundus
- model eye
- eye
- model
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- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000003384 imaging method Methods 0.000 claims abstract description 19
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 230000000007 visual effect Effects 0.000 claims abstract description 13
- 238000007689 inspection Methods 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 210000001742 aqueous humor Anatomy 0.000 description 2
- 210000000695 crystalline len Anatomy 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000004087 cornea Anatomy 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 210000004127 vitreous body Anatomy 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/0016—Operational features thereof
- A61B3/0025—Operational features thereof characterised by electronic signal processing, e.g. eye models
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/12—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/14—Arrangements specially adapted for eye photography
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/28—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for medicine
Abstract
The invention designs a model eye for fundus detection and a using method thereof. The model eye consists of three optical lenses and a negative film with a view angle scale and a resolution line pair, wherein the model eye sequentially comprises a first lens, a second lens, a third lens and a negative film from an object space to an image space, adjacent surfaces of the first lens, the second lens, the third lens and the negative film are tightly attached, and the view angle scale and the resolution line pair are arranged on an arc surface at the front part of the negative film. The invention also includes methods of using the model eye. The refractive index difference between the optical structure and the optical lens or the lens group in the invention simulates the actual human eye diopter system, and the scale and resolution line pair of the visual field marked on the negative film is according to the index requirement in ISO10940, and replaces the method in ISO10940 for detecting the visual field angle and resolution of the fundus imaging examination medical instrument represented by the fundus camera.
Description
Technical Field
The present invention relates to a model eye for fundus examination, which is suitable for use as a performance index of a fundus imaging examination medical instrument typified by a fundus camera for fundus examination.
Background
The medical instrument for eyeground imaging and examination mainly comprises an eyeground camera, an eyeground contrast machine, an eyeground scanner and the like. Among them, fundus cameras are typical representatives, and fundus is recorded and saved in the form of black and white or color photographs, thereby being used for diagnosis of fundus diseases. The main optical performance of the system comprises resolution, angle of view and the like, and the accuracy of the performance indexes is directly related to the effectiveness of diagnosis, and further related to the safety of eyes of patients. The international standard IS010940 of fundus camera products, ophthalmic instrument fundus camera, has already proposed that the resolution, angle of field, etc. in the current fundus camera international standard are measured using different optotypes at a distance of 1 meter from the fundus camera. The method is a theoretical method which is measured in the air and does not consider the actual human eye state.
Disclosure of Invention
The technical problem that this application solved is to the not enough of prior art, provides a model eye for fundus detection and application method thereof.
The application designs a model eye for fundus detection. The model eye consists of three optical lenses and a negative film with a view angle scale and a resolution line pair, wherein the whole lens sequentially comprises a first lens, a second lens, a third lens and a negative film from an object space to an image space, adjacent surfaces of the first lens, the second lens, the third lens and the negative film are tightly attached, and the view angle scale and the resolution line pair are arranged on an arc surface at the front part of the negative film.
The relative refractive index difference between the first lens and the second lens is 2.9%, the relative refractive index difference between the second lens and the third lens is 2.9%, and the deviation of the relative refractive index difference between the first lens and the second lens and the relative refractive index difference between the second lens and the third lens from the relative refractive index difference between any two layers (cornea and aqueous humor, aqueous humor and lens, lens and vitreous body) adjacent to the actual human eye refractive index tissue is not more than 1%.
The refraction characteristics simulate the refraction structure of an actual human eye, the focal length in equivalent air is 17mm, and the focal point is on the back curved surface of the third lens.
The dispersion spot radius of paraxial light and off-axis light is not more than 15% with the eye deviation of the classical Golgi model, and the included angle between the emergent principal ray and the fundus tangent is not more than 1 degree with the eye deviation of the classical Golgi model.
In the case of an entrance stop of 3mm, the MTF value of paraxial light is not more than 0.1 from the classical model eye deviation of golschland.
The field angle scale grid value is 0.5 deg., and the maximum field angle reading is 60 deg..
The resolution line pair includes the following specifications: 25lp/mm, 40lp/mm, 60lp/mm, 80lp/mm, 100lp/mm.
The technical scheme adopted for solving the technical problems further comprises the using method of the model eye for fundus detection: the method is characterized by comprising the following steps of:
placing the model eye at the object side of the fundus imaging inspection medical instrument by using an adjusting mechanism, and adjusting the relative position of the posture of the model eye and the fundus imaging inspection medical instrument so that the optical axis of the model eye coincides with the optical axis of the fundus imaging inspection medical instrument and images clearly;
the fundus imaging inspection type medical instrument is used for observing the resolution line pairs on the model fundus film after photographing, and respectively reading the resolution line pairs (detection results of resolution indexes) which can be resolved clearly at the center of the visual field, the middle of the visual field and the edge of the visual field;
and respectively reading the field angle scale readings of the edges of the fields of view in four orthogonal directions, and calculating to obtain a field angle value (a detection result of the field angle index).
The beneficial effects of this application are: the model eye for fundus imaging inspection is simple in structure, good in universality and suitable for replacing a theoretical method in international standard ISO10940 to detect the angle of view and resolution of fundus imaging inspection medical instruments represented by fundus cameras.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present application.
In fig. 1: 1-a first lens; 2-a second lens; 3-a third lens; 4-a negative with a field angle scale and a resolution line pair.
FIG. 2 is a schematic plan view of a negative film with a field angle scale and resolution line pairs.
FIG. 3 is a schematic diagram of a center field of view resolution pair.
FIG. 4 is a schematic diagram of a non-center field of view resolution line pair.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The left side is the front and the right side is the rear in fig. 1.
Reference is made to fig. 1 for a model eye for fundus examination. The model eye consists of three optical lenses, a negative 4 with a field angle scale and resolution line pairs. The whole lens sequentially comprises a first lens 1, a second lens 2, a third lens 3 and a negative film 4 from an object space to an image space, wherein adjacent surfaces of the first lens 1, the second lens 2, the third lens 3 and the negative film 4 are closely attached, and the view angle scale and the resolution line pair are arranged on the adjacent surface (cambered surface in front of the negative film 4) of the negative film 4 and the third lens 3.
The first lens 1 is a convex lens, the radiuses of the front surface and the rear surface are respectively 8 and-14.027, the center thickness is 4.5, and the material is K9 glass; the second lens 2 is a concave lens, the radius of the front surface and the rear surface are respectively-14.027 and 9.988, the center thickness is 1.5, and the material is H-BAK5 glass; the third lens 3 is a convex lens, the radius of the front surface and the rear surface are 9.988 and-11.476 respectively, the center thickness is 19.264, and the material is K9 glass.
The field angle scale grid value is 0.5 deg., and the maximum field angle reading is 60 deg..
The resolution line pair (scribe line) includes the following specifications: 25lp/mm, 40lp/mm, 60lp/mm, 80lp/mm, 100lp/mm.
The application designs a model eye for fundus detection, which is applicable to replace the theoretical method in the international standard ISO10940 for detecting the angle of view and the resolution of a fundus imaging examination medical instrument represented by a fundus camera.
The detection method comprises the following steps: placing the model eye at the object side of the fundus imaging inspection medical instrument by using an adjusting mechanism, and adjusting the relative position of the posture of the model eye and the fundus imaging inspection medical instrument so that the optical axis of the model eye coincides with the optical axis of the fundus imaging inspection medical instrument and images clearly;
the fundus imaging inspection type medical instrument is used for observing the resolution line pairs on the model fundus film after photographing, and respectively reading the resolution line pairs (detection results of resolution indexes) which can be resolved clearly at the center of the visual field, the middle of the visual field and the edge of the visual field;
and respectively reading the field angle scale readings of the edges of the fields of view in four orthogonal directions, and calculating to obtain a field angle value (a detection result of the field angle index).
The refractive index difference between the optical lenses or the lens groups in the invention simulates an actual human eye diopter system, and the scale and resolution line pair of a visual field marked on the negative film is according to the index requirements in ISO10940, and is used for detecting the visual field angle and resolution of a fundus imaging examination type medical instrument represented by a fundus camera instead of the method in ISO 10940.
Claims (7)
1. A model eye for fundus examination, characterized in that: the model eye consists of three optical lenses and a negative film with a view angle scale and a resolution line pair, the model eye sequentially comprises a first lens, a second lens, a third lens and a negative film from an object space to an image space, adjacent surfaces of the first lens, the second lens, the third lens and the negative film are tightly attached, and the view angle scale and the resolution line pair are arranged on an arc surface at the front part of the negative film; the relative refractive index difference between the first lens and the second lens is 2.9%, the relative refractive index difference between the second lens and the third lens is 2.9%, and the deviation of the relative refractive index difference between the first lens and the second lens and the relative refractive index difference between the second lens and the third lens and the relative refractive index difference between any two adjacent layers of the actual human eye refractive index tissue is not more than 1%; the resolution line pair comprises five specifications of 25lp/mm, 40lp/mm, 60lp/mm, 80lp/mm and 100lp/mm.
2. The model eye for fundus detection according to claim 1, wherein: the refraction characteristics simulate the refraction structure of an actual human eye, the focal length in equivalent air is 17mm, and the focal point is on the back curved surface of the third lens.
3. The model eye for fundus detection according to claim 1, wherein: the dispersion spot radius of paraxial light and off-axis light is not more than 15% with the eye deviation of the classical Golgi model, and the included angle between the emergent principal ray and the fundus tangent is not more than 1 degree with the eye deviation of the classical Golgi model.
4. The model eye for fundus detection according to claim 1, wherein: in the case of an entrance stop of 3mm, the MTF value of paraxial light is not more than 0.1 from the classical model eye deviation of golschland.
5. The model eye for fundus detection according to claim 1, wherein: the field angle scale grid value is 0.5 deg., and the maximum field angle reading is 60 deg..
6. The model eye for fundus detection according to claim 1, wherein: the first lens is a convex lens, the radiuses of the front surface and the rear surface of the first lens are respectively 8 and-14.027, the center thickness is 4.5, and the material is K9 glass; the second lens is a concave lens, the radius of the front surface and the rear surface of the second lens are respectively-14.027 and 9.988, the center thickness is 1.5, and the material is H-BAK5 glass; the third lens is a convex lens, the radius of the front surface and the rear surface of the third lens are 9.988 and-11.476 respectively, the center thickness is 19.264, and the material is K9 glass.
7. The method of using a model eye for fundus inspection according to any one of claims 1 to 6, comprising the steps of:
placing the model eye at the object side of the fundus imaging inspection medical instrument by using an adjusting mechanism, and adjusting the relative position of the posture of the model eye and the fundus imaging inspection medical instrument so that the optical axis of the model eye coincides with the optical axis of the fundus imaging inspection medical instrument and images clearly;
the fundus imaging inspection type medical instrument is used for observing after photographing resolution line pairs on a model fundus film, and respectively reading resolution line pairs which can be resolved clearly at the center of a visual field, the middle of the visual field and the edge of the visual field;
and respectively reading the field angle scale readings of the edges of the fields of view in four orthogonal directions, and calculating to obtain the field angle value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711032818.1A CN107647845B (en) | 2017-10-30 | 2017-10-30 | Model eye for fundus detection and application method thereof |
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| CN201711032818.1A CN107647845B (en) | 2017-10-30 | 2017-10-30 | Model eye for fundus detection and application method thereof |
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| CN107647845A CN107647845A (en) | 2018-02-02 |
| CN107647845B true CN107647845B (en) | 2024-02-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109739005A (en) * | 2019-01-29 | 2019-05-10 | 上海鼎州光电科技有限公司 | A kind of nearly eye detector lens |
| CN110680277B (en) * | 2019-09-16 | 2021-08-27 | 中国计量科学研究院 | Ophthalmic optical imaging and biological parameter measuring instrument calibration tool and use method thereof |
| CN110680276B (en) * | 2019-09-16 | 2021-08-27 | 中国计量科学研究院 | Ophthalmic optical imaging and biological parameter measuring instrument calibration tool and use method thereof |
| CN111238778A (en) * | 2019-12-30 | 2020-06-05 | 重庆大学 | Imaging performance detection system for active healthy ophthalmologic image products |
| CN112826439A (en) * | 2020-12-31 | 2021-05-25 | 重庆贝奥新视野医疗设备有限公司 | Ophthalmic optics coherence tomography instrument measuring device |
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| JP2010004968A (en) * | 2008-06-25 | 2010-01-14 | Kowa Co | Image processing method and apparatus |
| CN103315703A (en) * | 2013-05-31 | 2013-09-25 | 北京大学 | Human eye optical test model for fundus imaging |
| CN107028585A (en) * | 2015-10-16 | 2017-08-11 | 株式会社理光 | Use the structure of the individual eyes model of light-field camera |
| CN208573723U (en) * | 2017-10-30 | 2019-03-05 | 浙江省医疗器械检验院 | A kind of model eye for eyeground detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9001316B2 (en) * | 2013-07-29 | 2015-04-07 | Bausch & Lomb Incorporated | Use of an optical system simulating behavior of human eye to generate retinal images and an image quality metric to evaluate same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010004968A (en) * | 2008-06-25 | 2010-01-14 | Kowa Co | Image processing method and apparatus |
| CN103315703A (en) * | 2013-05-31 | 2013-09-25 | 北京大学 | Human eye optical test model for fundus imaging |
| CN107028585A (en) * | 2015-10-16 | 2017-08-11 | 株式会社理光 | Use the structure of the individual eyes model of light-field camera |
| CN208573723U (en) * | 2017-10-30 | 2019-03-05 | 浙江省医疗器械检验院 | A kind of model eye for eyeground detection |
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