System of retinal visual acuity determination based on random phase screens for diagnostics of initial shapes of cataracts

Alexander V. Novokhreshenov; Valery V. Bakutkin; Valery V. Tuchin; Vladimir P. Ryabukho; Irina L. Maksimova; Mihail V. Orekhov

doi:10.1117/12.479432

14 July 2003 System of retinal visual acuity determination based on random phase screens for diagnostics of initial shapes of cataracts

Alexander V. Novokhreshenov, Valery V. Bakutkin, Valery V. Tuchin, Vladimir P. Ryabukho, Irina L. Maksimova, Mihail V. Orekhov

Author Affiliations +

Proceedings Volume 4951, Ophthalmic Technologies XIII; (2003) https://doi.org/10.1117/12.479432
Event: Biomedical Optics, 2003, San Jose, CA, United States

Abstract

The new optical system for interference determination of retinal visual acuity (RVA) based on the use special diffraction elements random phase screens with two identical microstructures is offered. The system includes low coherence sources with quasi-monochromatic red, green, and blue light colors and special diffraction optical element that creates on patient retina an interference pattern with parallel fringes of a particular color. The restuls of the system application in diagnostics of the earliest age patholgocal changes of the lens of eye are discussed. 42 patients (74 eyes) with the initial shapes of cataract and control group without pathology are surveyed. It is established, that at the patients with initial shapes of cataract the values of RVA by green and dark blue colors are lower than it by red, and at the patients without pathology these values coincide. Intensity of scattering light depends on the wavelength, and the interference pattern contrast at the presence of lens inhomogeneities is variable for different wavelengths. Hence, the given system can be used for diagnostics of the earliest age pathological changes in a lens.

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Alexander V. Novokhreshenov, Valery V. Bakutkin, Valery V. Tuchin, Vladimir P. Ryabukho, Irina L. Maksimova, and Mihail V. Orekhov "System of retinal visual acuity determination based on random phase screens for diagnostics of initial shapes of cataracts", Proc. SPIE 4951, Ophthalmic Technologies XIII, (14 July 2003); https://doi.org/10.1117/12.479432

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KEYWORDS

Particles

Eye

Light scattering

Diagnostics

Scattering

Diffraction

Light

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