JPS6458239A - Fundus camera - Google Patents

Abstract

PURPOSE:To obtain a stereoscopic image due to a definite base length, that is, a definite solid angle, by providing an index having a plurality of reference lines to the observing surface of the fundus of an observing optical system so as to be vertical to a direction connecting a pair of beam sources, and successively matching a plurality of cornea reflected images due to the beam sources with the reference lines. CONSTITUTION:The beams from a pair of beam sources 2a, 2b are incident to the cornea Ec by an objective lens 1 so as to form images at the intermediate points Pa, Pb of the apex and center of curvature of the cornea Ec of an eye E to be examined and reflected by the cornea Ec to form cornea reflected images Qa, Qb at the rear side focus of an objective lens 1 by the objective lens 1. When the optical axis Eo of the eye E to be examined coincides wit the optical axis O of a fundus camera, the cornea reflected images Qa, Qb are formed symmetrically with respect to the optical axis O. When the optical axis O is shifted from the optical axis Eo by the half of the interval between the intermediate points Pa, Pb of the eye E to be examined, since the cornea reflected image Qb comes to the center of a visual field and can be observed, the first stereoscopic image is taken at this time. Next, when the optical axis Eo of the eye E to be examined is shifted by the same quantity in the reverse direction, since the cornea reflected image Qa comes to the center of the visual field at this time, the second image is taken at this time. When these photographs are respectively looked by let and right eyes, a stereoscopic image wherein a base length is set as the interval of the intermediate points Pa, Pb can be observed.