Apparatus and technique for automatic centering and focusing a c

Details Apparatus and technique for automatic centering and focusing a c Apparatus and technique for automatic centering and focusing a c

1993-04-14

1996-06-11

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351212, 351221, 351246, A61B 3107, A61B 315

Patent

active

055260721

ABSTRACT:
A corneal topographer including a directional light source, a CCD and a positioning stage all controlled by a computer for automatically centering and focusing the corneal image onto the CCD. The computer receives video signals from the CCD representing the corneal image, which is digitized and displayed on a real-time basis on a monitor screen. A reflection of the directional light source is positioned to align in the center of the corneal image. An operator moves an optics head to place the corneal image on the monitor screen, roughly focuses the image, and then commands the computer to take over. The computer calculates the distance between the image of the directional light source and the center of the CCD, and activates the positioning stage to move the directional light source image to the center. The positioning stage is moved within a focusing range, where several positions and corresponding intensity characteristics of the directional light source image are tabulated. A best fit algorithm calculates the maximum intensity characteristic corresponding to the maximum focus, and the computer moves the optics head to a position corresponding to maximum focus.

REFERENCES:
patent: 3248162 (1966-04-01), Knoll
patent: 3432227 (1969-03-01), Soper
patent: 3598478 (1971-08-01), Townsley
patent: 3781096 (1973-12-01), Townsley
patent: 3797921 (1974-03-01), Kilmer et al.
patent: 3937566 (1976-02-01), Townsley
patent: 4019813 (1977-04-01), Cornsweet et al.
patent: 4569576 (1986-02-01), Karpov et al.
patent: 4662730 (1987-05-01), Outwater et al.
patent: 4685140 (1987-08-01), Mount, II
patent: 4692003 (1987-09-01), Adachi et al.
patent: 4761071 (1988-08-01), Baron
patent: 4772115 (1988-09-01), Gersten et al.
patent: 4863260 (1989-09-01), Gersten et al.
patent: 4881807 (1989-11-01), Luce et al.
patent: 4902123 (1990-02-01), Yoder, Jr.
patent: 4978213 (1990-12-01), El Hage
patent: 4995716 (1991-02-01), Warmicki et al.
patent: 5009498 (1991-04-01), Gersten et al.
patent: 5018850 (1991-05-01), Gersten et al.
patent: 5062702 (1991-11-01), Bille
patent: 5106183 (1992-04-01), Yoder, Jr.
patent: 5159361 (1992-10-01), Cambier et al.
patent: 5212505 (1993-05-01), Penney
patent: 5214456 (1993-05-01), Gersten
patent: 5300965 (1994-04-01), Kitajima
patent: 5307096 (1994-04-01), Baroth et al.
Klyce, Stephen D.; "Computer-Assisted Corneal Topography"; Investigative Ophthalmology & Visual Science; vol. 25, Dec. 1984, pp. 1426-1435.
Fundamentals of Corneal Topography, brochure by EyeSys Technologies, 1992.
TMS-1 Topographic Modeling System brochure by Tomey Technology, Inc. 1992.

Affiliated with

Also associated with

Rating

Apparatus and technique for automatic centering and focusing a c does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and technique for automatic centering and focusing a c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and technique for automatic centering and focusing a c will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-356119