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Optical system and detection method of transmission eyesight detecting instrument

An optical system, transmissive technology, applied in the field of optical systems

Inactive Publication Date: 2005-12-14
NANKAI UNIV
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  • Summary
  • Abstract
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Problems solved by technology

This makes it possible to measure the visual acuity of cataract patients

Method used

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  • Optical system and detection method of transmission eyesight detecting instrument
  • Optical system and detection method of transmission eyesight detecting instrument
  • Optical system and detection method of transmission eyesight detecting instrument

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Embodiment

[0032] System structural parameters and design examples of optical components:

[0033] The specific parameters of the system structure and the design of each optical component are as follows:

[0034] The focal length f1=30mm of condenser lens 2, the focal length f2=370mm of collimating lens 5, the focal length f3=95mm of imaging lens 7, the distance of filter pinhole 3 to collimating lens 5 is 165mm, collimating lens 5 to imaging lens The distance of 7 is 215mm, and the aperture of filter aperture 3 is d=0.2mm.

[0035] Calculated by geometric optics theory:

[0036] The filter pinhole 3 also forms a reduced image at 117mm behind the imaging lens 7, and the image point size d'=0.082mm, that is to say, the imaging beam converges to 0.082mm at this place, and the eye pupil can be aligned with the Eye point. Make the imaging thin light beam pass through the tiny gap in the cloudy lens of the cataract patient, and the vision resolution board 6 forms an image on the retina to d...

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Abstract

The present invention relates to optical system for eyesight detecting instrument, and is especially the optical system and detection method of instrument for measuring the latent eyesight of retina in eye of different visual degree. The instrument is specially for detecting the visual function of eyes of cataract sufferer, and the design and relevant parameters of different optical parts are given out. Transmission eyesight resolution chart is adopted for enough fine imaging light beam entering the pupil and enough light flux. The miniature interval in the cloudy lens of the cataract sufferer is imaged onto the retina and the transmission eyesight resolution chart is moved to focus, so as to measure the diopter of the eye. The eyesight is detected via watching the eyesight resolution chart. The instrument of the present invention is significant in cataract treatment.

Description

technical field [0001] The present invention relates to an optical system of a visual acuity tester, in particular to an optical system of a visual acuity tester for measuring retinal latent vision of different diopters and a detection method thereof, which is used for special vision (potential vision) of cataract patients before operation ) detection. Background technique [0002] For cataract eye disease patients, we researched and designed the optical system of the transmissive vision tester. Cataract is a common eye disease that seriously affects vision. It is known that millions of cataract patients undergo intraocular lens replacement surgery every year. One of the most important issues for doctors and patients is the visual performance after replacement of intraocular lens surgery. What level is reached, that is, to exclude the influence of cataract (lens), and to detect the potential visual ability of other factors (including: cornea, retina). Usually, the visual a...

Claims

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Application Information

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IPC IPC(8): A61B3/00
Inventor 方志良刘福来杨勇
Owner NANKAI UNIV
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