Design of an in-vivo microscope to characterize cataracts in human eyes

Chen Feng; Anees Ahmad

doi:10.1117/12.256224

1 November 1996 Design of an in-vivo microscope to characterize cataracts in human eyes

Chen Feng, Anees Ahmad

Proceedings Volume 2863, Current Developments in Optical Design and Engineering VI; (1996) https://doi.org/10.1117/12.256224
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

The design of a compact contact microscope, which can be used in-vivo to study the cataracts in human eyes is presented. This microscope has the capability to evaluate the changes in the optical density within the eye lens itself, and thus enabling an examiner to ascertain the progression of a cataractous change or at least the optical changes associated with cataractous development. The microscope has a variable focal length so it can be focused at any depth through the entire thickness of the eye lens. A separate small objective lens is spring loaded against the cornea (like a tonometer tip) so that the natural eye movements can occur safely during the examination. The distance between the objective lens and rest of the optics is variable to accommodate the movements of the eye due to pulse or breathing without affecting the image quality of the instrument. The layer by layer images can be captured on a CCD camera and stored in the computer. The reconstruction software can quantitatively display the characteristics of the cataracts, such as the location, size, and density. The optical design and performance results for the microscope are presented. The optomechanical design features of the microscope are also discussed.

Citation Download Citation

Chen Feng and Anees Ahmad "Design of an in-vivo microscope to characterize cataracts in human eyes", Proc. SPIE 2863, Current Developments in Optical Design and Engineering VI, (1 November 1996); https://doi.org/10.1117/12.256224

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