Illumination light control circuit for eye-ground photography

A light control and circuit technology, applied in ophthalmoscopes, eye testing equipment, applications, etc., can solve the problems of damage to the retina, discomfort to the human eye, and high cost, and achieve the goal of reducing irritation, reducing production costs, and improving clarity. Effect

Inactive Publication Date: 2015-07-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In practical application, it is found that after the subjects dilate their pupils, the recovery time is relatively long. At this time, if encountering strong light, the human eyes will be very uncomfortable and even damage the retina. Therefore, in ...

Method used

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  • Illumination light control circuit for eye-ground photography
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  • Illumination light control circuit for eye-ground photography

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0026] see figure 1 , an illumination light control circuit for fundus photography, comprising: an eyepiece and an objective lens 2, a semi-transparent half-reflective prism 3, an illumination lens group 4, an imaging objective lens 5, an image sensor 6, an LED lighting lamp 7 and a computer 8, wherein , the eyepiece and the objective lens 2, the half-reflective prism 3, the imaging objective lens 5 and the image sensor 6 are arranged in sequence, and an illuminating lens group 4 is arranged between the half-reflective prism 3 and the LED lighting lamp 7;

[0027] Among them, the LED lighting lamp 7 is driven by a triangular wave or sawtooth wave electrical signal to generate a beam of triangular wave or sawtooth waveform illumination light, and the triangular wave or sawtooth waveform illumination light sequentially passes through the illumination lens group 4, the semi-transparent and half-reflective prism 3, the eyepiece and the objective lens 2 irradiates the fundus of the...

Embodiment 2

[0042] see figure 2 , an illumination light control circuit for fundus photography, the difference between the illumination light control circuit and Embodiment 1 is that the image sensor 6 is specifically a CCD image sensor 61, and the illumination light control circuit includes: an eyepiece and an objective lens 2, a translucent Semi-reflective prism 3, illumination lens group 4, imaging objective lens 5, CCD image sensor 61, LED lighting lamp 7 and computer 8, wherein, connect eyepiece and objective lens 2, semi-transparent half-reflective prism 3, imaging objective lens 5 and CCD image sensor 61 Arranged in sequence, an illuminating lens group 4 is arranged between the half-transparent and half-reflecting prism 3 and the LED illuminating lamp 7;

[0043] Among them, the LED lighting lamp 7 is driven by a triangular wave or sawtooth wave electrical signal to generate a beam of triangular wave or sawtooth waveform illumination light, and the triangular wave or sawtooth wave...

Embodiment 3

[0047] see image 3 , an illumination light control circuit for fundus photography, the difference between the illumination light control circuit and embodiment 1 is that the image sensor 6 is specifically a CMOS image sensor 62, and the illumination light control circuit includes: an eyepiece and an objective lens 2, a translucent Semi-reflective prism 3, lighting lens group 4, imaging objective lens 5, CMOS image sensor 62, LED lighting lamp 7 and computer 8, wherein, connect eyepiece and objective lens 2, semi-transparent half-reflective prism 3, imaging objective lens 5 and CMOS image sensor 62 Arranged in sequence, an illuminating lens group 4 is arranged between the half-transparent and half-reflecting prism 3 and the LED illuminating lamp 7;

[0048] Among them, the LED lighting lamp 7 is driven by a triangular wave or sawtooth wave electrical signal to generate a beam of triangular wave or sawtooth waveform illumination light, and the triangular wave or sawtooth wavefo...

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Abstract

The invention discloses an illumination light control circuit for eye-ground photography and relates to the field of eye-ground photography. The illumination light control circuit is characterized in that an LED (Light Emitting Diode) illumination lamp is driven by a triangular wave or sawtooth wave electric signal to generate a beam of triangular wave or sawtooth wave illumination light; the triangular wave or sawtooth wave illumination light sequentially passes through an illumination lens group, a semi-transmitting and semi-reflecting prism, an eyepiece and an objective lens and radiates eye grounds of measured human eyes; light reflected from the eye grounds of the measured human eyes also sequentially passes through the eyepiece, the objective lens, the semi-transmitting and semi-reflecting prism and imaging objective lens and an image is presented on an image sensor; the image sensor obtains all-frame video images of one or a plurality of triangular waves or sawtooth waves or sawtooth wave periods and transmits the all-frame video images to a computer; the image sensor can be used for cumulative average of sliding frames of the all-frame video images within the time duration to obtain an eye-ground image signal with higher definition. According to the scheme, over half of illumination light intensity can be reduced, and further the stimulation degree to a testee is greatly reduced; in addition, the definition of an eye-ground image is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of fundus photography, in particular to an illumination light control circuit for fundus photography. Background technique [0002] During the fundus examination, it is necessary to observe the retina, optic nerve and macula inside the eye through the pupil. When light hits the eye, the pupil naturally narrows to accommodate the light, which hinders the examination of the fundus. In order to solve this problem, the eyes are generally anesthetized in advance so that the pupils will not change with the change of light. [0003] In practical application, it is found that after the subjects dilate their pupils, the recovery time is relatively long. At this time, if encountering strong light, the human eyes will be very uncomfortable and even damage the retina. Therefore, in recent years, the fundus photography technology without mydriasis has been developed. , this technology uses high-sensitivity photoelectric devices ...

Claims

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Application Information

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IPC IPC(8): A61B3/12A61B3/14
Inventor 林凌杜文芳冯夕萌李淑娟李刚
Owner TIANJIN UNIV
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