Neodymium: YAG laser induced shock wave overpressures at the retina. Master's thesis
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.
- Research Organization:
- Air Force Inst. of Tech., Wright-Patterson AFB, OH (USA). School of Engineering
- OSTI ID:
- 5740894
- Report Number(s):
- AD-A-124731/1; AFIT/GEP/PH-82D-23
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NEODYMIUM LASERS
HEALTH HAZARDS
RETINA
BIOLOGICAL MODELS
BIOLOGICAL EFFECTS
COMPUTERIZED SIMULATION
ENERGY
EQUATIONS
EYES
PRESSURE DEPENDENCE
RADIATION EFFECTS
SENSITIVITY
SHOCK WAVES
BODY
BODY AREAS
FACE
HAZARDS
HEAD
LASERS
ORGANS
SENSE ORGANS
SIMULATION
SOLID STATE LASERS
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