Eye tissue structure and refraction alterations upon nondestructive laser action
| Autor: | A. V. Bolshunov, Alexey V. Myakov, Olga I. Baum, Emil N. Sobol, Alexander I. Omelchenko, V. V. Lunin, N. Yu. Ignat’eva, V. I. Sipliviy, O. L. Zakharkina, V. A. Kamenskiy |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
genetic structures medicine.diagnostic_test business.industry Eye refraction Optical polarization Condensed Matter Physics Laser Refraction eye diseases Industrial and Manufacturing Engineering Atomic and Molecular Physics and Optics law.invention Sclera Optics medicine.anatomical_structure Optical coherence tomography law Cornea medicine sense organs Irradiation business Instrumentation |
| Zdroj: | Laser Physics. 16:735-740 |
| ISSN: | 1555-6611 1054-660X |
| DOI: | 10.1134/s1054660x0605001x |
| Popis: | A new approach to alterations in eye refraction upon nondestructive laser action on the sclera and cornea is studied. It is demonstrated in in vivo experiments on rabbit eyes that sequential laser irradiation of the sclera and cornea yields a significant alteration in the eye refraction. The collagen structure of the sclera and cornea is studied after the nondestructive laser action with noninvasive polarization-sensitive optical coherence tomography. It is demonstrated that collagen fibers that provide for the cornea tension and applanation partially survive in the zone of the local denaturation of sclera. An irradiation mode that corresponds to an increase in the cornea’s plasticity and does not cause visible structural changes is chosen. The simplest theoretical model for alterations in the eye refraction upon the nonablative laser action on sclera is analyzed. The alteration in the cornea curvature upon stretching resulting from the local sclera coagulation and the corresponding decrease in its volume is calculated. The model makes it possible to approximately estimate the laser irradiation modes that provide the desired alterations in eye refraction. |
| Databáze: | OpenAIRE |
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