Automated hand-held keratometer

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

351211, 351212, A61B 310

Patent

active

057934681

ABSTRACT:
An automated portable keratometer includes a hand held housing and is battery powered. A projection system projects collimated light sources at equal converging angles to an optical axis which extends outside the housing. A camera, including an imaging device, and telocentric objective lens are aligned along the optical axis in the housing. The projection system projects a known pattern of collimated light sources onto a patient's eye. The reflected images of these light sources is captured by the camera and imaging device. Derivation of the distances between certain reflected images can be converted by known algorithms into radii of curvature of the eye. Alignment leveling, and other features can be included with the keratometer. The device can also be used to measure other curved surfaces.

REFERENCES:
patent: Re27475 (1972-09-01), Volk
patent: 1006825 (1911-10-01), Buchhop
patent: 1721208 (1929-07-01), Currier et al.
patent: 1750931 (1930-03-01), Kellner et al.
patent: 2174308 (1939-09-01), Hartinger
patent: 3108523 (1963-10-01), Nuchman et al.
patent: 3141396 (1964-07-01), Kimball et al.
patent: 3169459 (1965-02-01), Friedberg et al.
patent: 3248162 (1966-04-01), Knoll
patent: 3264932 (1966-08-01), Hendricks
patent: 3404936 (1968-10-01), Bennett et al.
patent: 3416855 (1968-12-01), McClernon
patent: 3432227 (1969-03-01), Soper
patent: 3442579 (1969-05-01), Friedberg
patent: 3453437 (1969-07-01), Westheimer et al.
patent: 3486812 (1969-12-01), Volk
patent: 3487069 (1969-12-01), Masselli
patent: 3536384 (1970-10-01), Cocks
patent: 3542458 (1970-11-01), Volk
patent: 3544220 (1970-12-01), Kaye
patent: 3552837 (1971-01-01), Volk
patent: 3572909 (1971-03-01), Van Patten et al.
patent: 3598478 (1971-08-01), Townsley
patent: 3634003 (1972-01-01), Guyton
patent: 3664631 (1972-05-01), Guyton
patent: 3669530 (1972-06-01), Guyton
patent: 3797921 (1974-03-01), Kilmer et al.
patent: 3871772 (1975-03-01), Munnerlyn et al.
patent: 3879113 (1975-04-01), Howland et al.
patent: 3883233 (1975-05-01), Guilino
patent: 3932030 (1976-01-01), Hasegawa et al.
patent: 3969019 (1976-07-01), Nohda
patent: 3972602 (1976-08-01), Inns
patent: 4019813 (1977-04-01), Cornsweet et al.
patent: 4021102 (1977-05-01), Iizuka
patent: 4157859 (1979-06-01), Terry
patent: 4159867 (1979-07-01), Achatz et al.
patent: 4162828 (1979-07-01), Trachtman
patent: 4165744 (1979-08-01), Cravy et al.
patent: 4172639 (1979-10-01), Lang et al.
patent: 4180323 (1979-12-01), Persson et al.
patent: 4196980 (1980-04-01), Heine
patent: 4199816 (1980-04-01), Humphrey
patent: 4220401 (1980-09-01), Muchel
patent: 4256385 (1981-03-01), Cohen et al.
patent: 4293198 (1981-10-01), Kohayakawa et al.
patent: 4293199 (1981-10-01), Wada et al.
patent: 4304468 (1981-12-01), Wada
patent: 4312574 (1982-01-01), Wilms
patent: 4315672 (1982-02-01), Muller et al.
patent: 4353625 (1982-10-01), Nohda et al.
patent: 4355871 (1982-10-01), Nevyas et al.
patent: 4367019 (1983-01-01), Kitao et al.
patent: 4372655 (1983-02-01), Matsumura et al.
patent: 4373787 (1983-02-01), Crane et al.
patent: 4390255 (1983-06-01), Nohda et al.
patent: 4396261 (1983-08-01), Herbert
patent: 4407572 (1983-10-01), Humphrey
patent: 4410243 (1983-10-01), Furste
patent: 4420228 (1983-12-01), Humphrey
patent: 4421391 (1983-12-01), Matsumura et al.
patent: 4429960 (1984-02-01), Mocilac et al.
patent: 4440477 (1984-04-01), Schachar
patent: 4444476 (1984-04-01), Simon et al.
patent: 4453808 (1984-06-01), Takahashi et al.
patent: 4491398 (1985-01-01), Karickhoff
patent: 4529280 (1985-07-01), Nohda
patent: 4533221 (1985-08-01), Trachtman
patent: 4540254 (1985-09-01), Humphrey
patent: 4569576 (1986-02-01), Karpov et al.
patent: 4572628 (1986-02-01), Nohda
patent: 4588270 (1986-05-01), Tamaki
patent: 4597648 (1986-07-01), Feldon et al.
patent: 4606623 (1986-08-01), Schachar
patent: 4609287 (1986-09-01), Kohayakawa
patent: 4637700 (1987-01-01), Krueger
patent: 4660945 (1987-04-01), Trachtman
patent: 4660946 (1987-04-01), Nakamura et al.
patent: 4662730 (1987-05-01), Outwater et al.
patent: 4692003 (1987-09-01), Adachi et al.
patent: 4697895 (1987-10-01), Sekiguchi et al.
patent: 4705037 (1987-11-01), Peyman et al.
patent: 4710003 (1987-12-01), Masuda et al.
patent: 4730917 (1988-03-01), Krueger
patent: 4753527 (1988-06-01), Ishihara
patent: 4755043 (1988-07-01), Carter
patent: 4761070 (1988-08-01), Fukuma
patent: 4761071 (1988-08-01), Baron
patent: 4768875 (1988-09-01), Muller
patent: 4772114 (1988-09-01), Fukui et al.
patent: 4772115 (1988-09-01), Gersten et al.
patent: 4779973 (1988-10-01), Miller et al.
patent: 4828381 (1989-05-01), Shindo
patent: 4848896 (1989-07-01), Matsumoto
patent: 4863280 (1989-09-01), Gersten et al.
patent: 4881807 (1989-11-01), Luce et al.
patent: 4903706 (1990-02-01), Vila-Cora et al.
patent: 5011276 (1991-04-01), Iwamoto
patent: 5157427 (1992-10-01), Humphrey
patent: 5189449 (1993-02-01), Perkins
patent: 5585873 (1996-12-01), Shalon et al.
R.E. Frazer, et al., National Aeronautics and Space Administration, "NASA Tech Brief: Real-Time Keratometer", Aug. 1988, 2 pages, Springfield, Virginia, U.S.
Topcon, "Topcon Lensmeter LM-6/LM-6E", 1988 (4 pages).
Topcon, "Lensmeter LM-S1", 1989, (2 pages).
Topcon, "KR-3000 Auto Kerato-Refractometer", 1990, (4 pages).
Terence C. Honikman, Ph.D., "Trends in lols & Refractive Surgery", Oct. 2, 1985, (9 pages).
Allergan Humphrey, "Humphrey Lens Analyzer", 1989, (2 pages).
Topcon, "Digital Projection Lensmeter LM-P5", 1989, (3 pages).
Marco, "Lensmeter 101 and Lensmeter 201", date unknown, (1 page).
Allergan Humphrey, "Auto Keratometer", 1989, (2 pages).
Marco, "Keratometer I and Keratometer II", 1989 (4 pages).
Topcon, "Computerized Lensmeter CL-2000", 1989, (4 pages).
Marco Technologies, "ARK-2000 Automatic Refractor/Keratometer", date unknown, (2 pages).
Marco Technologies, "LM-870 Automatic Lensmeter", date unknown, (2 pages).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Automated hand-held keratometer does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

     

Profile ID: LFUS-PAI-O-394312

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.