Ophthalmological measurement method and apparatus

Details Ophthalmological measurement method and apparatus Ophthalmological measurement method and apparatus

1990-04-09

1992-07-14

Smith, Ruth S.

Surgery

Truss

Pad

128691, 351206, 351210, 351221, 356 285, A61B 3113

Patent

active

051294001

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 thus mirrors the travel speed of the blood cells in the eye tissues. The differences in the speckle signal are used to identify the blood vessel for automatic tracking of the blood vessel or for measurement of its diameter.

REFERENCES:
patent: 4346991 (1982-08-01), Gardner et al.
patent: 4402601 (1983-09-01), Riva
patent: 4443075 (1984-04-01), Crane
patent: 4848897 (1989-07-01), Aizu et al.
patent: 4856891 (1989-08-01), Pflibsen et al.
patent: 4972836 (1990-11-01), Schenck et al.

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