Ophthalmologic instrument

Details Ophthalmologic instrument Ophthalmologic instrument

1995-10-26

1997-03-25

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 314

Patent

active

056149662

ABSTRACT:
In order to detect an alignment state while watching an index image, illumination light is first projected onto an anterior segment of a subject's eye (E) from LEDs (21), and then light emitted by another LED (31) is guided to a cornea (C) through an alignment light projecting optical system (30). The light emitted by the LEDs (21, 31) and reflected by the subject's eye (E) is imaged on a CCD camera (26) through an image-formation optical system (20). An index image (SP) and an anterior segment image (E') which are of the reflection light guided to the CCD camera (26) are displayed on a screen (28). The index image (SP) is received by a sensor (46). Based on information about received light obtained by the sensor (46), a comparator (47) detects information about alignment of the subject's eye (E) with an instrument body. According to a detection result obtained by the comparator (47), a display state of the display (28) is changed, so that an operator judges that a desired state of alignment is nearing.

REFERENCES:
patent: 5465123 (1995-11-01), Iijima

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