Neodymium: YAG Laser Induced Shock Wave Overpressures at the Retina.
Abstract
The use of a neodymium: YAG laser to open opacified posterior capsules in the human eye was examined. This study involved the development of a one-dimensional hydrodynamic code to model the propagation of the shock wave in the vitreous, and the measurement of overpressures induced in a model system. The model system consisted of balanced salt solution in a cubical test cell. A pressure transducer was affixed to the rear of the cell, and 15 nsec Q-switched laser pulses were focused at distances of 6, 8, 10, and 14 mm from the transducer to initiate shock waves. Overpressures were measured for pulse energies of 3.75, 7.50, and 22.50 mJ at the focal point. Overpressures ranging from 0.018 - 0.432 atm were recorded at the transducer. The code was tested for a pulse energy of 3.75 mJ and predicted a pressure change of 2%, in excellent agreement with measured values. For pulse energies of 7.50 and 22.50 mJ, the maximum deviation was 5% from measured pressure differences.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1982
- Accession Number
- ADA124731
Entities
People
- John Franklin Turner
Organizations
- Air Force Institute of Technology