Coaxial spatially resolved refractometer

Details Coaxial spatially resolved refractometer Coaxial spatially resolved refractometer

1998-12-07

2000-08-08

Manuel, George

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 310

Patent

active

060991259

ABSTRACT:
A refractometer provides a reference path coaxial with a measurement path and thereby simplifies construction by reducing the number of parts and simplifies maintenance by halving the number of optical axes to be aligned. The refractometer includes a reference projector for projecting a reference pattern on a reference pattern position on a detector during a reference interval, a site-selector for selecting a measurement site on an optical system, and a measurement projector for projecting a measurement pattern through this selected measurement site and onto a measurement pattern position on the detector during a measurement interval. The reference projector, the site selector, and the measurement projector are all aligned along the same optical axis. In the case in which the optical system is a human eye, the designated site in typically a site on the cornea and the detector is the retina of the eye. The refractometer provides an aligner for aligning the reference pattern position with a measurement pattern position. The amount by which these two positions are moved in order to achieve alignment provides a measure of the optimal wavefront corresponding to the measurement site.

REFERENCES:
patent: 4609287 (1986-09-01), Kohayakawa
patent: 4772120 (1988-09-01), Pointeau
patent: 5258791 (1993-11-01), Penney et al.
patent: 5757463 (1998-05-01), Kohayakawa
patent: 5847805 (1998-12-01), Kohayakawa et al.

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