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GB1209451A - Improvements in and relating to apparatus for measuring parts of the human eye - Google Patents

Improvements in and relating to apparatus for measuring parts of the human eye

Info

Publication number
GB1209451A
GB1209451A GB223767A GB223767A GB1209451A GB 1209451 A GB1209451 A GB 1209451A GB 223767 A GB223767 A GB 223767A GB 223767 A GB223767 A GB 223767A GB 1209451 A GB1209451 A GB 1209451A
Authority
GB
United Kingdom
Prior art keywords
cornea
screen
lens
eye
corneal
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB223767A
Inventor
Desmond Smart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Research and Development Co Ltd
Original Assignee
International Research and Development Co Ltd
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 International Research and Development Co Ltd filed Critical International Research and Development Co Ltd
Priority to GB223767A priority Critical patent/GB1209451A/en
Publication of GB1209451A publication Critical patent/GB1209451A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • A61B3/1005—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring distances inside the eye, e.g. thickness of the cornea
    • 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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

1,209,451. Measuring the cornea. INTERNATIONAL RESEARCH & DEVELOPMENT CO. Ltd. Jan 12, 1968 [Jan. 16, 1967], No. 2237/67. Heading G2J. Apparatus for measuring corneal thickness and corneal radii comprises a low power gas laser 1, preferably a helium-neon gas laser, which directs a light beam on to the cornea of an eye, the person's head being supported by a frame 2; an objective lens 3 and a screen 4 mounted on a graduated optical bench 5. The lens 3 is moved until two images, one from light reflected off the front surface of the cornea and the other from light reflected off the back surface, are simultaneously formed on the screen with the first mentioned image coinciding with the optical axis. The distance between the images and the angle of incidence of the laser beam on the eye are measured, thus enabling the thickness of the cornea to be determined. To find the radii of the cornea, the lens and screen are adjusted until the first image is in focus on the screen. The distances of the lens from the eye and the screen from the lens are measured and the outer corneal radius determined. Similar measurements are made for the second image, and the inner corneal radius is found.
GB223767A 1967-01-16 1967-01-16 Improvements in and relating to apparatus for measuring parts of the human eye Expired GB1209451A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB223767A GB1209451A (en) 1967-01-16 1967-01-16 Improvements in and relating to apparatus for measuring parts of the human eye

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB223767A GB1209451A (en) 1967-01-16 1967-01-16 Improvements in and relating to apparatus for measuring parts of the human eye

Publications (1)

Publication Number Publication Date
GB1209451A true GB1209451A (en) 1970-10-21

Family

ID=9736019

Family Applications (1)

Application Number Title Priority Date Filing Date
GB223767A Expired GB1209451A (en) 1967-01-16 1967-01-16 Improvements in and relating to apparatus for measuring parts of the human eye

Country Status (1)

Country Link
GB (1) GB1209451A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306409A1 (en) * 1987-09-04 1989-03-08 Alain Azema Optical system for the determination of the variation of the curvature of an object within a zone of small dimensions
WO2009127442A1 (en) * 2008-04-17 2009-10-22 Vereniging Vu-Windesheim Apparatus for corneal shape analysis and method for determining a corneal thickness
EP2453823A1 (en) * 2009-07-14 2012-05-23 WaveTec Vision Systems, Inc. Ophthalmic surgery measurement system
US8475439B2 (en) 2004-04-20 2013-07-02 Wavetec Vision Systems, Inc. Integrated surgical microscope and wavefront sensor
US8619405B2 (en) 2007-10-31 2013-12-31 Wavetec Vision Systems, Inc. Wavefront sensor
US8632185B2 (en) 2003-04-10 2014-01-21 Wavetec Vision Systems, Inc. Intraoperative estimation of intraocular lens power
US8764187B2 (en) 2009-07-14 2014-07-01 Wavetec Vision Systems, Inc. Determination of the effective lens position of an intraocular lens using aphakic refractive power
US8876290B2 (en) 2009-07-06 2014-11-04 Wavetec Vision Systems, Inc. Objective quality metric for ocular wavefront measurements
US9072462B2 (en) 2012-09-27 2015-07-07 Wavetec Vision Systems, Inc. Geometric optical power measurement device
US9307904B2 (en) 2008-11-06 2016-04-12 Wavetec Vision Systems, Inc. Optical angular measurement system for ophthalmic applications and method for positioning of a toric intraocular lens with increased accuracy
US9743832B2 (en) 2008-04-17 2017-08-29 Cassini B.V. Apparatus for corneal shape analysis and method for determining a corneal thickness

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2620219A1 (en) * 1987-09-04 1989-03-10 Synthelabo OPTICAL SYSTEM FOR DETERMINING THE VARIATION OF CURVATURE OF AN OBJECT ON A SMALL DIMENSION AREA
US4902122A (en) * 1987-09-04 1990-02-20 Synthelabo Optical system for determining the variation of curvature of an object on a zone of small dimensions
EP0306409A1 (en) * 1987-09-04 1989-03-08 Alain Azema Optical system for the determination of the variation of the curvature of an object within a zone of small dimensions
US9168127B2 (en) 2003-04-10 2015-10-27 Wavetec Vision Systems, Inc. Intraoperative estimation of intraocular lens power
US9445890B2 (en) 2003-04-10 2016-09-20 Wavetec Vision Systems, Inc. Intraoperative estimation of intraocular lens power
US8632185B2 (en) 2003-04-10 2014-01-21 Wavetec Vision Systems, Inc. Intraoperative estimation of intraocular lens power
US9420949B2 (en) 2004-04-20 2016-08-23 Wavetec Vision Systems, Inc. Integrated surgical microscope and wavefront sensor
US9107612B2 (en) 2004-04-20 2015-08-18 Wavetec Vision Systems, Inc. Integrated surgical microscope and wavefront sensor
US8475439B2 (en) 2004-04-20 2013-07-02 Wavetec Vision Systems, Inc. Integrated surgical microscope and wavefront sensor
US9295381B2 (en) 2007-10-31 2016-03-29 Wavetec Vision Systems, Inc. Wavefront sensor
US8619405B2 (en) 2007-10-31 2013-12-31 Wavetec Vision Systems, Inc. Wavefront sensor
US9743832B2 (en) 2008-04-17 2017-08-29 Cassini B.V. Apparatus for corneal shape analysis and method for determining a corneal thickness
US9004689B2 (en) 2008-04-17 2015-04-14 Vereniging Vu-Windesheim Apparatus for corneal shape analysis and method for determining a corneal thickness
WO2009127442A1 (en) * 2008-04-17 2009-10-22 Vereniging Vu-Windesheim Apparatus for corneal shape analysis and method for determining a corneal thickness
US9307904B2 (en) 2008-11-06 2016-04-12 Wavetec Vision Systems, Inc. Optical angular measurement system for ophthalmic applications and method for positioning of a toric intraocular lens with increased accuracy
US8876290B2 (en) 2009-07-06 2014-11-04 Wavetec Vision Systems, Inc. Objective quality metric for ocular wavefront measurements
US9603516B2 (en) 2009-07-06 2017-03-28 Wavetec Vision Systems, Inc. Objective quality metric for ocular wavefront measurements
EP2453823A4 (en) * 2009-07-14 2013-01-23 Wavetec Vision Systems Inc Ophthalmic surgery measurement system
US9259149B2 (en) 2009-07-14 2016-02-16 Wavetec Vision Systems, Inc. Ophthalmic surgery measurement system
CN102497833B (en) * 2009-07-14 2014-12-03 波技术视觉系统公司 Ophthalmic surgery measurement system
US8764187B2 (en) 2009-07-14 2014-07-01 Wavetec Vision Systems, Inc. Determination of the effective lens position of an intraocular lens using aphakic refractive power
US8545023B2 (en) 2009-07-14 2013-10-01 Wavetec Vision Systems, Inc. Ophthalmic surgery measurement system
US9554697B2 (en) 2009-07-14 2017-01-31 Wavetec Vision Systems, Inc. Determination of the effective lens position of an intraocular lens using aphakic refractive power
CN102497833A (en) * 2009-07-14 2012-06-13 波技术视觉系统公司 Ophthalmic surgery measurement system
EP2453823A1 (en) * 2009-07-14 2012-05-23 WaveTec Vision Systems, Inc. Ophthalmic surgery measurement system
US9072462B2 (en) 2012-09-27 2015-07-07 Wavetec Vision Systems, Inc. Geometric optical power measurement device
US9339180B2 (en) 2012-09-27 2016-05-17 Wavetec Vision Systems, Inc. Geometric optical power measurement device

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees