JPS5674608A - Measuring device for radius of curvature of cornea front - Google Patents

Measuring device for radius of curvature of cornea front

Info

Publication number
JPS5674608A
JPS5674608A JP15223679A JP15223679A JPS5674608A JP S5674608 A JPS5674608 A JP S5674608A JP 15223679 A JP15223679 A JP 15223679A JP 15223679 A JP15223679 A JP 15223679A JP S5674608 A JPS5674608 A JP S5674608A
Authority
JP
Japan
Prior art keywords
cornea
travelling
projection lens
slit screen
curvature
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
JP15223679A
Other languages
Japanese (ja)
Other versions
JPS6149971B2 (en
Inventor
Kunio Irisawa
Shigeaki Nakagawa
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.)
Mamiya-OP Co Ltd
Original Assignee
Mamiya Camera 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 Mamiya Camera Co Ltd filed Critical Mamiya Camera Co Ltd
Priority to JP15223679A priority Critical patent/JPS5674608A/en
Publication of JPS5674608A publication Critical patent/JPS5674608A/en
Publication of JPS6149971B2 publication Critical patent/JPS6149971B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Eye Examination Apparatus (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

PURPOSE: To measure the radius of curvature in a short time, by projecting a parallel ray according to travelling of the slit screen onto the front of the cornea, and counting a pulse which is generated by synchronizing with travelling of the slit screen while a reflected ray is detected by plural photodetectors.
CONSTITUTION: A diaphragm 2 is provided to the rear focusing position of the projection lens 1, a slit screen 3 which is able to travel in the direction meeting at right angles with the optical axis of the projection lens is provided to the nearly conjugate position against the cornea 4 of an eye to be measured, placing the projection lens between them, and a light beam of the light source 5 is projected onto the cornea as a parallel ray according to the travelling position of the slit screen. The photodetectors 6, 6' are provided to plural positions having different angles against the optical axis of the projection lens, a pulse signal which is generated by syncheronizing with travelling is counted extending from the full line position of the slit screen 3 detected by the detector 6 to the virtual line position detected by the detector 6', and by this count value, the radius of curvature of the cornea is measured as a digital amount.
COPYRIGHT: (C)1981,JPO&Japio
JP15223679A 1979-11-24 1979-11-24 Measuring device for radius of curvature of cornea front Granted JPS5674608A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15223679A JPS5674608A (en) 1979-11-24 1979-11-24 Measuring device for radius of curvature of cornea front

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15223679A JPS5674608A (en) 1979-11-24 1979-11-24 Measuring device for radius of curvature of cornea front

Publications (2)

Publication Number Publication Date
JPS5674608A true JPS5674608A (en) 1981-06-20
JPS6149971B2 JPS6149971B2 (en) 1986-10-31

Family

ID=15536056

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15223679A Granted JPS5674608A (en) 1979-11-24 1979-11-24 Measuring device for radius of curvature of cornea front

Country Status (1)

Country Link
JP (1) JPS5674608A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59125541A (en) * 1983-01-06 1984-07-19 キヤノン株式会社 Corneal topography measurement device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59125541A (en) * 1983-01-06 1984-07-19 キヤノン株式会社 Corneal topography measurement device

Also Published As

Publication number Publication date
JPS6149971B2 (en) 1986-10-31

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