Optical model for the propagation of light during transscleral cyclophotocoagulation

Babak Nemati; Henry Grady Rylander III; Ashley J. Welch

doi:10.1117/12.178562

23 June 1994 Optical model for the propagation of light during transscleral cyclophotocoagulation

Babak Nemati, Henry Grady Rylander III, Ashley J. Welch

Proceedings Volume 2126, Ophthalmic Technologies IV; (1994) https://doi.org/10.1117/12.178562
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

A number of recent studies have demonstrated the efficacy of transscleral Nd:YAG and diode cyclophotocoagulation in the reduction of intraocular pressure. The choice of an appropriate wavelength for this treatment modality has been based on a tradeoff of maximal transmission through the superficial layers of conjunctiva and sclera, and maximal absorption in the ciliary body. A UV-Vis-NIR spectrophotometer was used to determine the optical properties of the conjunctiva, sclera, and the ciliary body. These optical properties were used in a Monte Carlo Model to examine the fluence and the resulting rate of heat generation in each layer for the wavelengths of Nd:YAG (1064 nm), semiconductor diode (850 nm), Ruby (693 nm), Krypton yellow (568 nm), and Argon (514 nm) lasers. The results provided a basis for a theoretical prediction of the extent of thermal damage in the ciliary body as a result of transsclerral cyclophotocoagulation. Key Words: transscleral cyclophotocoagulation, Monte Carlo Model, rate of heat generation, Nd:YAG laser, Argon laser, Krypton laser, Ruby laser, semiconductor diode laser.

Citation Download Citation

Babak Nemati, Henry Grady Rylander III, and Ashley J. Welch "Optical model for the propagation of light during transscleral cyclophotocoagulation", Proc. SPIE 2126, Ophthalmic Technologies IV, (23 June 1994); https://doi.org/10.1117/12.178562

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