Ophthalmologic device having means for classifying the picture d

Details Ophthalmologic device having means for classifying the picture d Ophthalmologic device having means for classifying the picture d

1997-04-10

1998-09-29

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, 351221, A61B 310

Patent

active

058152407

ABSTRACT:
An ophthalmologic device measures corneal curvature and ocular refractive power of the eye by imaging the positions of a plurality of bright points which result from plural light rays and by imaging a predetermined pattern of the eye. The ophthalmologic device includes a frame memory to store picture data of the eye which has been imaged by a video camera. The picture data in memory is classified into bright spot regions in which bright spots are present one at a time, a corneal reflected image region in which a reflected image from the cornea of a predetermined pattern is projected into the fundus of the eye, and mask regions in which the bright points and the corneal reflected image are not present. The picture data having a luminosity greater than a predetermined threshold value is stored for later calculation of a centroid of the bright points to measure the corneal curvature of the eye.

REFERENCES:
patent: 4859051 (1989-08-01), Fukuma et al.
patent: 4878750 (1989-11-01), Sekiguchi
patent: 4917458 (1990-04-01), Matsumura
patent: 5212507 (1993-05-01), Fujieda et al.
patent: 5214456 (1993-05-01), Gersten
patent: 5543887 (1996-08-01), Akashi
patent: 5548355 (1996-08-01), Iki

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