Ophthalmological measurement method and apparatus

Details Ophthalmological measurement method and apparatus Ophthalmological measurement method and apparatus

1990-04-09

1991-10-22

Smith, Ruth S.

Surgery

Truss

Pad

128691, 128745, 351221, A61B 310, A61B 314

Patent

active

050585967

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 then processed to derive therefrom its center of gravity, which is taken as a center of a blood vessel to identify the blood vessel. This enables the blood vessel parts to be identified with high accuracy and to be tracked automatically.

REFERENCES:
patent: 4346991 (1982-08-01), Gardner et al.
patent: 4743107 (1988-05-01), Aizu et al.
patent: 4848897 (1989-07-01), Aizu et al.

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