RU94046368A - Method and device for determining topography of cornea surface - Google Patents

Method and device for determining topography of cornea surface

Info

Publication number
RU94046368A
RU94046368A RU94046368/14A RU94046368A RU94046368A RU 94046368 A RU94046368 A RU 94046368A RU 94046368/14 A RU94046368/14 A RU 94046368/14A RU 94046368 A RU94046368 A RU 94046368A RU 94046368 A RU94046368 A RU 94046368A
Authority
RU
Russia
Prior art keywords
cornea
processed
image
placid
determining
Prior art date
Application number
RU94046368/14A
Other languages
Russian (ru)
Inventor
Генри М. Д'Суза
Us]
Эдвин Дж. Сарвер
Original Assignee
Айсис Лэбораториз (US)
Айсис Лэбораториз
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Айсис Лэбораториз (US), Айсис Лэбораториз filed Critical Айсис Лэбораториз (US)
Publication of RU94046368A publication Critical patent/RU94046368A/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/255—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring radius of curvature
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/107—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining the shape or measuring the curvature of the cornea

Abstract

FIELD: medical equipment. SUBSTANCE: multifunctional testing system for determining cornea surface shape has camera with display, controlled computer (charge-coupled device), "frame trap" plate and image digital treatment algorithm with corresponding processing circuits. Charge coupled device camera receives reflection of target, for example, placid disk, from surface of cornea. Image of charge coupled device reflection of placid disk from surface of cornea is trapped by plate of "frame trap" and subjected to digital analysis after it has been processed in edge detector. The latter reduces number of points of data, which has to be processed for determining radius of each ring at image of reflected placid disk. Received data are processed for getting contour of surface and for creating representation of data of circuit formed in such a manner in table, graphic or pictorial form. The system may be used for designing custom contact lenses. Complete topographic map of cornea can be build characterized by almost instant indication of radius of curvature of cornea from enough large number of points for precise evaluation of shape of surface. EFFECT: improved efficiency of operation.

Claims (1)

Изобретение относится к устройствам и способам для определения топографии поверхности роговой оболочки глаза с использованием клетчатого плацидо. Изобретение решает задачу создания полной топографической карты роговой оболочки с почти мгновенной индикацией радиуса кривизны роговой оболочки по достаточно большому количеству точек для точной оценки формы поверхности. Многофункциональная система анализа роговой оболочки для определения формы поверхности роговой оболочки глаза содержит камеру с дисплеем, управляемым компьютером (ПЗС), плату "захватывателя кадров" и алгоритм цифровой обработки изображений с соответствующими схемами обработки. Камера с ПЗС принимает отражение цели, например диска плацидо, от поверхности роговой оболочки. Изображение ПЗС отражения диска плацидо от поверхности роговой оболочки захватывается платой "захватывателя кадров" и подвергается цифровому анализу после обработки в детекторе краев. Детектор краев уменьшает количество точек данных, которое должно быть обработано для определения радиуса каждого кольца в изображении отраженного диска плацидо. Полученные данные обрабатываются для получения контура поверхности и для создания отображения в табличной, графической или изобразительной форме, сформированных таким образом данных о контуре. Эту систему можно использовать для проектирования заказных контактных линз.The invention relates to devices and methods for determining the topography of the surface of the cornea of the eye using checkered placid. The invention solves the problem of creating a complete topographic map of the cornea with an almost instantaneous indication of the radius of curvature of the cornea by a sufficiently large number of points for an accurate estimate of the surface shape. The multifunctional cornea analysis system for determining the surface shape of the cornea of the eye comprises a camera with a computer-controlled display (CCD), a “frame capturing” board, and an digital image processing algorithm with corresponding processing schemes. A CCD camera receives a reflection of a target, such as a placido disc, from the surface of the cornea. The image of the CCD of the reflection of the placido disc from the surface of the cornea is captured by a “frame capturing” board and digitally analyzed after processing in the edge detector. The edge detector reduces the number of data points that must be processed to determine the radius of each ring in the image of the reflected placido disk. The obtained data is processed to obtain a surface contour and to create a display in tabular, graphic or graphic form, thus formed on the contour data. This system can be used to design custom contact lenses.
RU94046368/14A 1992-06-02 1994-11-29 Method and device for determining topography of cornea surface RU94046368A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US89196192A 1992-06-02 1992-06-02
US891961 1997-07-14

Publications (1)

Publication Number Publication Date
RU94046368A true RU94046368A (en) 1996-09-20

Family

ID=25399127

Family Applications (1)

Application Number Title Priority Date Filing Date
RU94046368/14A RU94046368A (en) 1992-06-02 1994-11-29 Method and device for determining topography of cornea surface

Country Status (7)

Country Link
EP (1) EP0643566A1 (en)
JP (1) JP3387500B2 (en)
AU (1) AU4527293A (en)
BR (1) BR9306484A (en)
CA (1) CA2137151A1 (en)
RU (1) RU94046368A (en)
WO (1) WO1993024049A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2580195C2 (en) * 2011-09-27 2016-04-10 Джонсон Энд Джонсон Вижн Кэа, Инк. Method for designing noncircular soft contact lens
RU2585984C2 (en) * 2010-07-16 2016-06-10 Сисеидо Компани, Лтд. Device for simulating eye image, method of generating image of eye and eye image generating program

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3610139B2 (en) * 1995-12-26 2005-01-12 キヤノン株式会社 Fundus examination device
US6152565A (en) * 1997-12-31 2000-11-28 Premier Laser Systems, Inc. Handheld corneal topography system
JP3630973B2 (en) 1998-02-27 2005-03-23 株式会社ニデック Ophthalmic apparatus and method for storing optometry information in ophthalmic apparatus
DE69931419T2 (en) * 1998-03-31 2006-12-28 Nidek Co., Ltd., Gamagori Ophthalmic device
JP4652558B2 (en) * 2000-10-18 2011-03-16 株式会社トプコン Optical property measuring device
US6905209B2 (en) 2000-10-18 2005-06-14 Kabushiki Kaisha Topcon Optical characteristics measuring device
CN109068973B (en) * 2016-04-28 2021-01-29 亚历克斯·阿尔茨约科维奇 Keratometer with detachable micro microscope for cataract operation

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490022A (en) * 1982-01-04 1984-12-25 Reynolds Alvin E Apparatus for corneal corrective techniques
GB2123977B (en) * 1982-07-03 1986-04-16 Smith & Nephew Ass Ophthalmic test apparatus
US4692003A (en) * 1983-11-07 1987-09-08 Adachi Iwao P Real-time analysis keratometer
US4685140A (en) * 1984-06-26 1987-08-04 Kera Corporation Keratograph autoscanner system
US4799785A (en) * 1986-10-17 1989-01-24 Keates Richard H Cornea contour mapping
US4779973A (en) * 1986-11-06 1988-10-25 David Miller Photokeratometric device
US4863260A (en) * 1987-11-04 1989-09-05 Computed Anatomy Inc. System for topographical modeling of anatomical surfaces
US4995716A (en) * 1989-03-09 1991-02-26 Par Technology Corporation Method and apparatus for obtaining the topography of an object
US5110200A (en) * 1989-06-30 1992-05-05 Technitex, Inc. Video keratometer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2585984C2 (en) * 2010-07-16 2016-06-10 Сисеидо Компани, Лтд. Device for simulating eye image, method of generating image of eye and eye image generating program
RU2580195C2 (en) * 2011-09-27 2016-04-10 Джонсон Энд Джонсон Вижн Кэа, Инк. Method for designing noncircular soft contact lens

Also Published As

Publication number Publication date
CA2137151A1 (en) 1993-12-09
BR9306484A (en) 1998-12-08
JP3387500B2 (en) 2003-03-17
JPH08504108A (en) 1996-05-07
EP0643566A1 (en) 1995-03-22
WO1993024049A1 (en) 1993-12-09
AU4527293A (en) 1993-12-30

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