公开(公告)号：JPS6443229A

公开(公告)日：1989-02-15

申请号：JP18667488

申请日：1988-07-26

Applicant: ESSILOR INT

Inventor： KURISUCHIYAN BOBUE

IPC: A61B3/11

Abstract: PURPOSE: To automatically measure the inter-pupil distance of a human by forming an instrumentation coordinate system with a series of reference light sources linearly arranged according to regular pitches, and reading the existence of multiple cornea reflected rays via its scanning. CONSTITUTION: Reference light sources 28 form parallel luminous segments. Basic light sources 16 generate cornea reflected rays in sequence. The cornea reflected rays processed by a detecting acceptor 20 are generated by the basic light source 16 nearest to the general visual line directions DO, DG of corresponding eyes OD, OG. For the measurement of half inter-pupil distances ED, EG in relation to the general visual line direction D with a conversion table, the cornea reflected rays formed along the visual line directions DO, DG parallel with the visual line direction D in relation to the reference light sources 28 are positioned. Peaks TD, TG corresponding to the cornea reflected ray by the right eye OD and the cornea reflected ray by the left eye OG appear on a cornea reflected ray generator 12. The positions of the peaks TD, TG can be obtained by a trigonometrical calculation.