[특허]Ophthalmic diagnostic apparatus and method

Ophthalmic diagnostic apparatus and method 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61B-003/10
출원번호	US-0456109 (1989-12-22)
발명자 / 주소	Sklar H. Alfred (San Francisco CA) Frank Alan M. (Livermore CA) McMillan Charles (Livermore CA) Ferrer Olga M. (Miami FL)
출원인 / 주소	Phoenix Laser Systems, Inc. (San Francisco CA 02)
인용정보	피인용 횟수 : 72 인용 특허 : 0

초록 ▼

An ophthalmic diagnostic instrument determines the shape of the cornea through projection of an image onto the cornea through the optics of the diagnostic instrument. The instrument and the method of the invention involve folding a projected pattern of discrete separated point light sources so that the pattern is projected toward the eye coaxially with return collected light reflected off the cornea. The instrument avoids any need for a pattern light source directly adjacent to the eye, and provides the surgeon or other eye care specialist with a real time image accurately displaying the shape of the cornea. The surgeon is thus able to monitor the corneal shape prior to surgery, to monitor its changes during the course of the surgery, and to further monitor the cornea in post operative stages. In a specific embodiment of the invention, a real image of the pattern of point light sources is formed inside or very closely in front of the objective lens of the system so that the objective lens becomes a field lens and the angle of view of the system is enlarged.

대표청구항 ▼

An ophthalmic diagnostic instrument for determining the shape of the cornea of a patient\s eye, comprising, an objective lens as an optical element of the instrument, on an optical axis of the instrument, means for projecting a pattern of discrete separated point light sources and forming a real image of the pattern of point light sources at a position located between the interior of the objective lens and the patient\s eye, the real image including point light sources in positions which traverse substantially directly across the optical axis, means for expanding the region of coverage on the cornea by using the objective lens as a field lens for the pattern image, means for selecting and collecting a reflected image of the pattern as reflected paraxially off the cornea, and for detecting a reflected position of substantially each point light source, as reflected from the cornea, including means for relaying the Fourier plane of the objective lens to a relayed position in the instrument, with aperture means positioned at said relayed position for limiting the collected light to that which is reflected paraxially off the cornea, whereby the aperture means is a spaced distance from the objective lens, means for analyzing the returned, collected pattern image and for comparing it to the undistorted pattern as projected, including analyzing the relative location and spatial orientation of the reflected point light sources as compared to the pattern as projected, and means for deriving mathematically a close approximation of a corneal surface shape that would give rise to such a collected pattern image, whereby the real image point sources, extending substantially across the optical axis, enable enhanced measurement of the central optical zone about the visual axis of the cornea.

이 특허를 인용한 특허 (72)

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Lang Stefan (Munich DEX) Clonts David R. (Houston TX), Method and apparatus for providing precise location of points on the eye.
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Frey, Rudolph W.; Gray, Gary P., Method and system for measuring an eye.
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Farrer, Stephen W.; Raymond, Thomas D.; Xiong, Wei; Dixson, John; Neal, Daniel R., Method of locating valid light spots for optical measurement and optical measurement instrument employing method of locating valid light spots.
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Raymond, Thomas D.; Dixson, John G.; Farrer, Stephen W.; Xiong, Wei; Neal, Daniel R., Method of qualifying light spots for optical measurements and measurement instrument employing method of qualifying light spots.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Ophthalmic diagnostic apparatus and method 원문보기

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Ophthalmic diagnostic apparatus and method 원문보기

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연구과제 타임라인

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이 특허를 인용한 특허 (72)

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