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A continuing study on the feasibility of a Badal-type photoretinoscopic apparatus

1 May 1991


This is an experimental study of a photoretinoscopic apparatus based on the Badal optometer principle. The experimental set-up consisted of a two-element object array, +13.375 D input lens, +1.875 D intermediate lens, and +2.00 D output lens. An emmetropic human eye analogue was used to test the accuracy of the apparatus. One of the image sizes in the eye analogue was 20% larger than the other showing some departure from the Badal configuration, possibly due to errors in setting up optics for confocal relations. There is also a need for greater flux uniformity of the light source, and better quality lenses, so as to reduce aberrations, thereby enhancing resolution.


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