Ophthalmological measurement method and apparatus

Details Ophthalmological measurement method and apparatus Ophthalmological measurement method and apparatus

1990-04-09

1992-02-25

Dzierzynski, Paul M.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

128691, A61B 310

Patent

active

050907999

ABSTRACT:
In an ophthalmological measurement method and apparatus, a laser beam of predetermined diameter is projected to the eye fundus and movement of a speckle pattern formed by light scattered by blood cells in blood vessel is detected by a photosensor as fluctuation in speckle light intensity to produce a speckle signal. The speckle light intensity will fluctuate more rapidly with a smaller output from the photosensor when cell velocities are high, while a low cell travel speed will decrease the lowering of the output therefrom. The speckle signal is integrated to produce an integrated speckle signal which is evaluated in terms of a rate of change to discriminate edges of a blood vessel. The integrated speckle signal is used to identify the blood vessel for automatic tracking of the blood vessel or for measurement of its diameter.

REFERENCES:
patent: 4950070 (1990-08-01), Aizu et al.
patent: 4952050 (1990-08-01), Aizu et al.

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