Simple device for objective measurements of haze following excimer laser ablation of cornea

Russell L. McCally; Bernard F. Hochheimer; Wallace Chamon; Dimitri T. Azar M.D.

doi:10.1117/12.147535

24 June 1993 Simple device for objective measurements of haze following excimer laser ablation of cornea

Russell L. McCally, Bernard F. Hochheimer, Wallace Chamon, Dimitri T. Azar M.D.

Proceedings Volume 1877, Ophthalmic Technologies III; (1993) https://doi.org/10.1117/12.147535
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

We have developed a simple instrument for making objective measurements of haze that develops following excimer laser ablation of the cornea. It consists of an appropriately modified slit-lamp microscope, with a fiber optic pickup, a filter system for wavelength selection, and a photomultiplier detector. The scattered intensity at 120 degree(s) from the forward direction is determined. Preliminary tests were made by measuring the haze following a deep photorefractive ablation on a rabbit cornea under conditions which ensured that rather severe haze would develop. The VISX Model 20/20 laser system was set to produce a 6.0 mm diameter, -15 D correction, with a central depth of 236 micrometers . Measurements were made on the normal cornea prior to ablation and at various times up to 114 days post-ablation and are compared to slit-lamp photographs. Scattering peaked two weeks post-ablation at a value approximately 40X that of the normal (unablated) cornea and gradually decreased to approximately 11X the normal value at 114 days.

Citation Download Citation

Russell L. McCally, Bernard F. Hochheimer, Wallace Chamon, and Dimitri T. Azar M.D. "Simple device for objective measurements of haze following excimer laser ablation of cornea", Proc. SPIE 1877, Ophthalmic Technologies III, (24 June 1993); https://doi.org/10.1117/12.147535

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