Rectilinear photokeratoscope

Details Rectilinear photokeratoscope Rectilinear photokeratoscope

1991-11-01

1994-08-16

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351246, 351247, A61B 310

Patent

active

053391217

ABSTRACT:
A rectilinear keratoscope for determining the curvature of the anterior corneal surface of an eye. The keratoscope includes a translucent sheet having a curved pattern in the shape of a grid of intersecting individual curved lines. The pattern forms a substantially rectilinear grid image when reflected from a curved surface having a known radius of curvature. Deviations from a spherical surface can be qualitatively and quantitatively determined from examining the nature of the reflected image pattern and by measuring the spatial frequency of grid lines lying between a reference point and an image point corresponding to a point on the surface of the cornea whose refractive power is to be measured.

REFERENCES:
patent: 3169459 (1965-02-01), Friedberg et al.
patent: 3756702 (1973-09-01), Trachtman
patent: 4355871 (1982-10-01), Nevyas et al.
patent: 4398812 (1983-08-01), Kelman
patent: 4490022 (1984-12-01), Reynolds
patent: 4685140 (1987-08-01), Mount, II
patent: 4820039 (1989-04-01), Ahmad
patent: 4863260 (1989-09-01), Gersten et al.

Affiliated with

Also associated with

Rating

Rectilinear photokeratoscope does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rectilinear photokeratoscope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rectilinear photokeratoscope will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-956071