JPS6434320A - Fixation apparatus of ophthalmic instrument - Google Patents

Fixation apparatus of ophthalmic instrument

Info

Publication number
JPS6434320A
JPS6434320A JP62192202A JP19220287A JPS6434320A JP S6434320 A JPS6434320 A JP S6434320A JP 62192202 A JP62192202 A JP 62192202A JP 19220287 A JP19220287 A JP 19220287A JP S6434320 A JPS6434320 A JP S6434320A
Authority
JP
Japan
Prior art keywords
eye
fixation
examined
circular
apertures
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
JP62192202A
Other languages
Japanese (ja)
Other versions
JPH0431254B2 (en
Inventor
Shinya Tanaka
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP62192202A priority Critical patent/JPS6434320A/en
Publication of JPS6434320A publication Critical patent/JPS6434320A/en
Publication of JPH0431254B2 publication Critical patent/JPH0431254B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Eye Examination Apparatus (AREA)

Abstract

PURPOSE:To certainly perform fixation regardless of the refraction abnormality of an eye to be examined, in a fixation apparatus for fixing the glance of the eye to be examined, by arranging a plurality of apertures for fixation to the beam path between the eye to be examined and a beam source. CONSTITUTION:The beam from a beam source 17 is throttled by the first third circular apertures 13, 15, 16 and a nozzle 10 to be incident to the pupil of an eye E to be examined as fine diameter beam and reaches the eyeground Er. Herein, when the second circular aperture 15 is arranged at the focal position on the side of the beam source 17 of a projection lens 11 as a fixation object so as to have a proper opening, the opening image of the second circular aperture 15 is illuminated to be sharply observed when the eye E to be examined is emmetropia. When said eye E is a refraction abnormal eye, since the expanse of beam is limited by the first and third circular apertures 13, 16 and the nozzle 10, the blur quantity of the second aperture 15 being the fixation object is prescribed. By this method, certain fixation can be performed.
JP62192202A 1987-07-31 1987-07-31 Fixation apparatus of ophthalmic instrument Granted JPS6434320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62192202A JPS6434320A (en) 1987-07-31 1987-07-31 Fixation apparatus of ophthalmic instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62192202A JPS6434320A (en) 1987-07-31 1987-07-31 Fixation apparatus of ophthalmic instrument

Publications (2)

Publication Number Publication Date
JPS6434320A true JPS6434320A (en) 1989-02-03
JPH0431254B2 JPH0431254B2 (en) 1992-05-26

Family

ID=16287370

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62192202A Granted JPS6434320A (en) 1987-07-31 1987-07-31 Fixation apparatus of ophthalmic instrument

Country Status (1)

Country Link
JP (1) JPS6434320A (en)

Also Published As

Publication number Publication date
JPH0431254B2 (en) 1992-05-26

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees