Scanning laser retinoscopy: a new technique for evaluating optical properties of the cornea after refractive surgery

Frans J. Van de Velde M.D.; Marie Jose Tassignon; Rene Trau

doi:10.1117/12.297871

22 December 1997 Scanning laser retinoscopy: a new technique for evaluating optical properties of the cornea after refractive surgery

Frans J. Van de Velde M.D., Marie Jose Tassignon, Rene Trau

Author Affiliations +

Proceedings Volume 3192, Medical Applications of Lasers in Dermatology, Ophthalmology, Dentistry, and Endoscopy; (1997) https://doi.org/10.1117/12.297871
Event: BiOS Europe '97, 1997, San Remo, Italy

Abstract

We present a new technique, scanning laser retinoscopy, to spatially resolve in two dimensions the optical aberrations and refractive power of the ocular media. For this purpose, the Maxwellian view of a confocal scanning laser ophthalmoscope (SLO) is configured to scan simultaneously the posterior and the anterior segment of the eye at different levels of prefocussing. This set-up allows retinal imaging and psychophysics through different optical zones of the cornea and lens. In addition, the size of the anatomical pupil can be dynamically controlled by adjusting the colinear infrared and visible light intensities of the illuminating system. In retinoscopic images we can see a part of the retina superimposed by distinctive patterns of shadows in the pupillary area. The variable patterns of shadows in the retinoscopic images change with the level of prefocussing of the SLO. The patterns are the result of local variations in refraction or wavefront aberrations within the lens and cornea. In cases of excimer laser refractive surgery, for example, scanning laser retinoscopy is able to distinguish between a treated central area, transition zone and peripheral cornea. As a corollary, we can document differences between excimer laser delivery systems and also correlate the retinoscopic images with the subjective complaints of refractive surgery patients. These include monocular diplopia, glare, loss of contrast sensitivity besides reduced visual acuity.

Citation Download Citation

Frans J. Van de Velde M.D., Marie Jose Tassignon, and Rene Trau "Scanning laser retinoscopy: a new technique for evaluating optical properties of the cornea after refractive surgery", Proc. SPIE 3192, Medical Applications of Lasers in Dermatology, Ophthalmology, Dentistry, and Endoscopy, (22 December 1997); https://doi.org/10.1117/12.297871

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