US 5,861,937 A · Ophthalmic apparatus

Abstract

An ophthalmic apparatus having an examining unit which examines an eye to be examined, the apparatus comprising an alignment device for aligning the examining unit with each of a right eye and a left eye, including a target optical system which forms an alignment target on one eye, a corneal reflex forming device including an emitting optical system by which a corneal reflex is formed on the other eye, in which the emitting optical system emitting a luminous flux on relatively wide area where is defined based on dispersion of an interpupillary distance of an examinee, and an optical axis of the emitting optical system and an optical axis of the examining unit being spaced at a predetermined distance, a detecting optical system for detecting a corneal reflection being in a direction intersecting with the optical axis of the emitting optical system, including a limiting device which limits incidence of the corneal reflection and a positional detecting device which detects a position of the limited corneal reflection, and a calculating device for judging whether the aligned eye is a right eye or a left eye and/or calculating an interpupillary distance thereof, based on results detected by the detecting optical system.

Claims20

Dependent claims

An ophthalmic apparatus having an examining unit which examines an eye to be examined, the apparatus comprising:

alignment means for aligning said examining unit with each of a right eye and a left eye, including a target optical system which forms an alignment target on one eye;
corneal reflex forming means including an emitting optical system by which a corneal reflex is formed on the other eye, in which said emitting optical system emitting a luminous flux on relatively wide area where is defined based on dispersion of an interpupillary distance of an examinee, and an optical axis of said emitting optical system and an optical axis of said examining unit being spaced at a predetermined distance;
a detecting optical system for detecting a corneal reflection being in a direction intersecting with the optical axis of said emitting optical system, including limiting means which limits incidence of the corneal reflection and positional detecting means which detects a position of the limited corneal reflection;
and
calculating means for judging whether the aligned eye is a right eye or a left eye and/or calculating an interpupillary distance thereof, based on results detected by said detecting optical system.

2 more elements

An ophthalmic apparatus having an alignment target projecting optical system for projecting an alignment target onto a measuring eye in order to align a measuring optical system with the measuring eye, a distance-target projecting optical system for projecting a distance target onto the measuring eye in order to detect a working distance relative to the measuring eye, and a target detecting optical system for detecting respective corneal reflex formed by said both projecting optical systems, the apparatus comprising:

a front target-detecting optical system for a measuring eye for detecting a part of a luminous flux reflected by the cornea from the measuring eye, which is caused by said alignment target projecting optical system;
an emitting optical system for a non-measuring eye for emitting a luminous flux on a non-measuring eye;
a front target-detecting optical system for a non-measuring eye for detecting a luminous flux reflected by the cornea from the non-measuring eye, which is caused by said emitting optical system for a non-measuring eye;
judging means for judging whether the measuring eye is a right eye or a left eye, based on a detected signal from said front target-detecting optical system for a non-measuring eye;
and
calculating means for calculating an interpupillary distance between the measuring eye and the non-measuring eye, based on detected signals from said both front target-detecting optical systems and said detected working distance.

3 more elements

Dependencies are inferred from the claim text.

Ophthalmic apparatus

Life of this patent

Ophthalmic apparatus

Life of this patent

Abstract

Claims20