Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1992-06-03
1994-02-08
Ben, Loha
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351233, 359441, 359809, A61B 302, G02B 2702
Patent
active
052852245
ABSTRACT:
Methods and apparatus for measuring or determining refractive errors are disclosed. In some embodiments the invention includes two bars, each containing multiple lenses positioned longitudinally along the bar, and a collar adapted to constrain relative movement of the bars. Moving, or sliding, the bars and collar positions various lenses in the patient's line of sight, permitting the patient to determine which combination produces the best vision. If asymmetrical lenses are included in either bar, rotating the appropriate lens (either directly or by rotating the bar) provides additional information concerning the optimal refractive correction. The collar or bar may further comprise an indicator for signifying the angular rotation of any asymmetrical lens positioned along the patient's line of sight.
REFERENCES:
patent: 1222017 (1917-04-01), Moseley
patent: 1266224 (1918-05-01), Day
patent: 1337265 (1920-04-01), Poser
patent: 1550582 (1925-08-01), Sheard
patent: 1594196 (1926-07-01), Herold et al.
patent: 1794571 (1931-03-01), Wrighton et al.
patent: 2147448 (1939-02-01), Lee
patent: 2256491 (1941-09-01), Peck et al.
patent: 2333738 (1943-11-01), Peck et al.
patent: 2746346 (1956-05-01), Gaire
patent: 2874610 (1959-02-01), Wright
patent: 2923200 (1960-02-01), Wright
patent: 2938426 (1960-05-01), Armbruster et al.
patent: 2968213 (1961-01-01), Wright et al.
patent: 2995065 (1961-08-01), Wright et al.
patent: 3015984 (1962-01-01), Hemstreet
patent: 3136839 (1964-06-01), Safir
patent: 3163940 (1965-01-01), Geiser
patent: 3415594 (1968-12-01), Aulhorn
patent: 3428398 (1969-02-01), Gottschalk
patent: 3498699 (1970-03-01), Wilkenson
patent: 3524702 (1970-08-01), Bellows et al.
patent: 3572908 (1971-03-01), Grolman
patent: 3602580 (1971-08-01), Samuels
patent: 3664631 (1972-05-01), Guyton
patent: 3785723 (1974-01-01), Guyton
patent: 3791719 (1974-02-01), Kratzer et al.
patent: 3819256 (1971-06-01), Bellows et al.
patent: 3822932 (1974-07-01), Humphrey
patent: 3832066 (1974-08-01), Cornsweet
patent: 3841760 (1974-10-01), Guyton
patent: 3860330 (1975-01-01), Persson
patent: 3874774 (1975-04-01), Humphrey
patent: 3880502 (1975-04-01), Humphrey
patent: 3883233 (1975-05-01), Guilino
patent: 3969020 (1976-07-01), Lynn et al.
patent: 4015899 (1977-04-01), Humphrey
patent: 4021102 (1977-05-01), Iizuka
patent: 4105302 (1978-08-01), Tate, Jr.
patent: 4179196 (1979-12-01), Persson et al.
patent: 4180323 (1979-12-01), Persson et al.
patent: 4185896 (1980-01-01), Buhler
patent: 4190332 (1980-02-01), Body et al.
patent: 4215919 (1990-08-01), Rybicki
patent: 4385813 (1983-05-01), Klein et al.
patent: 4413891 (1983-11-01), Rybicki
patent: 4426140 (1984-01-01), Stephens
patent: 4436390 (1984-03-01), Aoki
patent: 4496226 (1985-01-01), Augusto et al.
patent: 4523822 (1985-06-01), Thurston
patent: 4606524 (1986-08-01), Wood
patent: 4746955 (1988-05-01), Slayton et al.
patent: 5122911 (1992-06-01), Kuo
patent: 5791132 (1897-08-01), Clark
Stokes, "On a Mode of Measuring the Astigmatism of a Defective Eye" (1983).
Dennett, "The Stokes' Lens for Measuring Astigmatism" (1985).
Jackson, "A Trial Set of Small Lenses in a Modified Trial Frame" (1887).
"Dr. Thomson's 1895 Correspondence Course in Optics with Historical Commentary by Monroe J. Hirsch".
Friedman, "The Jackson Crossed Cylinder, A Critique" (1940).
Crisp, "A New Cross-Cylinder Test for Astigmatic Axis, Without Use of Test Type" (1942).
Egan, "A Resume of Crossed Cylinder Application and Theory".
Littmann, "Fundamental Considerations About Opthalmometry".
Wunsh, "The Crossed Cylinder" (chapter 38 of Clinical Ophthalmology (vol 1), Duane, editor (1978).
Kaufman, "Subjective Refraction: Fogging Use of the Astigmatic Dials" (chapter 39 of Clinical Ophthalmology (vol. 1), Duane, editor (1978).
Duke-Elder and Abrams, "Ophthalmic Optics in Refraction" (1970) pp. 438-439.
Alverez, "Development of Variable-Focus Lenses and a New Refractor" (1978).
Michaels, Visual Optics and Refraction (chapter 12) (1980).
Guyton, "Automated Clinical Refraction" (chapter 67 of Clinical Opthalmology (vol. 1)), Duane, editor (1985).
Chapter 67 of "Clinical Ophthalmology," vol. 1, edited by Duane and Jaeger (1986).
Section 36 of Donders, "Accommodation and Refraction of the Eye" (1860 or 1864).
Page 12263 of "The American Encyclopedia and Dictionary of Ophthalmology," vol. 16, edited by Wood (1920).
pp. 7195-7197 of "The American Encyclopedia and Dictionary of Ophthalmology," vol. 10, edited by Wood (1917).
p. 438 in vol. 5 of "System of Ophthalmology," entitled Ophthalmic Optics and Refraction, by Duek-Elder and Agrams (1970).
An advertisement of Stereo Optical Co., Inc. entitled "New Sensitivity for Routine Amsler Grid Testing".
A brochure of Stereo Optical Co., Inc. entitled "Polarized Threshold Amsler Grid System".
pp. 449-465 of "System of Diseases of the Eye," vol. 4, edited by Norris and Oliver (1900).
Chapters V and VIII-XII of Thorington, Refraction and How to Refract, P. Blakiston's Son & Co. (1900).
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