FR2307511A1 - Curvature measuring optical system in ophthalmometer - has lens groups with intermediate rotary prisms each deflecting section of beam - Google Patents

Curvature measuring optical system in ophthalmometer - has lens groups with intermediate rotary prisms each deflecting section of beam

Info

Publication number
FR2307511A1
FR2307511A1 FR7511993A FR7511993A FR2307511A1 FR 2307511 A1 FR2307511 A1 FR 2307511A1 FR 7511993 A FR7511993 A FR 7511993A FR 7511993 A FR7511993 A FR 7511993A FR 2307511 A1 FR2307511 A1 FR 2307511A1
Authority
FR
France
Prior art keywords
lens groups
ophthalmometer
optical system
measuring optical
curvature measuring
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.)
Granted
Application number
FR7511993A
Other languages
French (fr)
Other versions
FR2307511B1 (en
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.)
Nikon Corp
Original Assignee
Nippon Kogaku KK
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 Nippon Kogaku KK filed Critical Nippon Kogaku KK
Priority to FR7511993A priority Critical patent/FR2307511A1/en
Publication of FR2307511A1 publication Critical patent/FR2307511A1/en
Application granted granted Critical
Publication of FR2307511B1 publication Critical patent/FR2307511B1/fr
Granted 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
    • A61B3/107—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
    • 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

Landscapes

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

Abstract

A curvature measuring optical system in an ophthalmometer comprises a first and a second lens group and rotary prisms disposed between the two lens groups. A light-intercepting member formed with at least three openings is disposed just behind the first lens group to divide the light beam between the two lens groups, and the rotary prisms are a first rotary prism member behind one of the openings to cause a light beam to be deflected on the focal plane in a predetermined direction and a second rotary prism member behind another opening to cause a light beam to be deflected on the focal plane in a perpendicular direction.
FR7511993A 1975-04-17 1975-04-17 Curvature measuring optical system in ophthalmometer - has lens groups with intermediate rotary prisms each deflecting section of beam Granted FR2307511A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7511993A FR2307511A1 (en) 1975-04-17 1975-04-17 Curvature measuring optical system in ophthalmometer - has lens groups with intermediate rotary prisms each deflecting section of beam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7511993A FR2307511A1 (en) 1975-04-17 1975-04-17 Curvature measuring optical system in ophthalmometer - has lens groups with intermediate rotary prisms each deflecting section of beam

Publications (2)

Publication Number Publication Date
FR2307511A1 true FR2307511A1 (en) 1976-11-12
FR2307511B1 FR2307511B1 (en) 1977-11-18

Family

ID=9154081

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7511993A Granted FR2307511A1 (en) 1975-04-17 1975-04-17 Curvature measuring optical system in ophthalmometer - has lens groups with intermediate rotary prisms each deflecting section of beam

Country Status (1)

Country Link
FR (1) FR2307511A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191100792A (en) * 1911-01-11 1911-09-21 John William Pearson Improvements in or connected with Ophthalmometers.
FR713016A (en) * 1930-03-14 1931-10-17 Zeiss Carl Method and instrument for the determination of the convexity of the cornea
FR1211981A (en) * 1958-12-26 1960-03-21 Ophthalmometer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191100792A (en) * 1911-01-11 1911-09-21 John William Pearson Improvements in or connected with Ophthalmometers.
FR713016A (en) * 1930-03-14 1931-10-17 Zeiss Carl Method and instrument for the determination of the convexity of the cornea
FR1211981A (en) * 1958-12-26 1960-03-21 Ophthalmometer

Also Published As

Publication number Publication date
FR2307511B1 (en) 1977-11-18

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Legal Events

Date Code Title Description
ST Notification of lapse