JPS6440029A - Opthalmological instrument - Google Patents

Opthalmological instrument

Info

Publication number
JPS6440029A
JPS6440029A JP62195551A JP19555187A JPS6440029A JP S6440029 A JPS6440029 A JP S6440029A JP 62195551 A JP62195551 A JP 62195551A JP 19555187 A JP19555187 A JP 19555187A JP S6440029 A JPS6440029 A JP S6440029A
Authority
JP
Japan
Prior art keywords
alignment
index
index images
cornea
vertex
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.)
Pending
Application number
JP62195551A
Other languages
Japanese (ja)
Inventor
Masaru Chichii
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.)
Topcon Corp
Original Assignee
Topcon Corp
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 Topcon Corp filed Critical Topcon Corp
Priority to JP62195551A priority Critical patent/JPS6440029A/en
Publication of JPS6440029A publication Critical patent/JPS6440029A/en
Pending 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
    • A61B3/14—Arrangements specially adapted for eye photography
    • A61B3/15—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing
    • A61B3/152—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing for aligning

Abstract

PURPOSE:To discriminate a proper alignment of objectives from an improper alignment thereof, by utilizing a constitution wherein an index receptor system can extinguish part of reflected index images when the vertex of a cornea to be inspected is positioned in the vicinity of a position where index images are formed. CONSTITUTION:When the vertex R of a cornea is positioned in a position where secondary alignment index images X1', X2' and X3' are formed and objectives are in improper alignment, luminous fluxes which give rise to primary index images X2 and X3 undergo specular reflection by the cornea so as to form index images X2' and X3' in the vicinity of the vertex R. Optical elements which constitute an index receptor system 27b are projected to form index images X2' and X3' in the vicinity of the vertex R, and alignment index fluxes which have undergone specular reflection by the cornea C are shielded by a stop 16. As a result, alignment reflection index images Y2' and Y3' are extinguished and only an alignment reflection index image Y1' is formed on a receptor plane 25a. Thus the improper alignment can be readily discriminated to thereby attain a proper alignment of objectives.
JP62195551A 1987-08-05 1987-08-05 Opthalmological instrument Pending JPS6440029A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62195551A JPS6440029A (en) 1987-08-05 1987-08-05 Opthalmological instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62195551A JPS6440029A (en) 1987-08-05 1987-08-05 Opthalmological instrument

Publications (1)

Publication Number Publication Date
JPS6440029A true JPS6440029A (en) 1989-02-10

Family

ID=16342985

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62195551A Pending JPS6440029A (en) 1987-08-05 1987-08-05 Opthalmological instrument

Country Status (1)

Country Link
JP (1) JPS6440029A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01270848A (en) * 1988-04-22 1989-10-30 Canon Inc Eyeground camera
JP2006068331A (en) * 2004-09-02 2006-03-16 Nidek Co Ltd Fundus camera
JP2007202725A (en) * 2006-01-31 2007-08-16 Nidek Co Ltd Fundus camera

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01270848A (en) * 1988-04-22 1989-10-30 Canon Inc Eyeground camera
JP2006068331A (en) * 2004-09-02 2006-03-16 Nidek Co Ltd Fundus camera
JP2007202725A (en) * 2006-01-31 2007-08-16 Nidek Co Ltd Fundus camera

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