Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1995-03-14
1996-09-17
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351213, A61B 314, A61B 310
Patent
active
055573509
ABSTRACT:
An ophthalmometric apparatus, such as an apparatus for measuring the opacity of the lens of the examinee's eye, comprises an alignment light projecting optical system for projecting alignment light rays on the examinee's eye, a position detecting optical system for detecting the position of a bright spot of corneal reflection formed by the alignment light projecting optical system, a position calculating means for calculating position data representing the position of the examinee's eye relative to a reference position on the basis of detection data provided by the position detecting optical system, an observation optical system for observing the front of the examinee's eye, provided with a filter means for intercepting at least part of the alignment light rays, and a display means for displaying the front of the examinee's eye, the bright spot of the corneal reflection, an image of a reference mark, and position data representing the position of the examinee's eye in an XYZ coordinate system on the observation optical system.
REFERENCES:
patent: 5436679 (1995-07-01), Ohtsuka et al.
Mai Huy
Nidek Co. Ltd.
Sikes William L.
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