Ophthalmological diagnosis method

Details Ophthalmological diagnosis method Ophthalmological diagnosis method

1990-03-05

1992-05-26

Dzierzynski, Paul M.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351206, 356 39, A61B 310

Patent

active

051161168

ABSTRACT:
An ophthalmological diagnosis method is provided in which a laser beam is projected at a region of the eye fundus to produce a laser speckle pattern formed by light scattered from tissues of the eye fundus. Movement of the speckle pattern is detected to produce a speckle signal which is photon-counted as photoelectric pulses per unit sampling time. The counted data are stored in a computer memory as time series data over one measurement time. The stored data are then processed to provide a correlation function using different delay times and are also divided per unit time. For the divided data, the correlation function or variance is calculated for each unit time. Such an arrangement makes it possible to accomplish accurate evaluation even when there is movement of the eye fundus and thus ensures that measurement data are fully utilized to provide accurate ophthalmological diagnosis.

REFERENCES:
patent: 4166695 (1979-09-01), Hill et al.
patent: 4402601 (1983-09-01), Riva
patent: 4848897 (1989-07-01), Aizu et al.

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