Apparatus and method for subjective determination of the...

Details Apparatus and method for subjective determination of the... Apparatus and method for subjective determination of the...

2011-06-21

2011-06-21

Schwartz, Jordan M. (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

C351S237000, C351S246000

Reexamination Certificate

active

07963654

ABSTRACT:
The invention provides for a subjective refractor for determining refractive error of the eye comprising an optical system for presenting at least two targets to the eye, the difference of focus between the targets greater than the predicted depth of focus of the eye; —means for indicating target preference from the presented targets; and means for determining refractive error of the eye on the basis of target preference.

REFERENCES:
patent: 3758201 (1973-09-01), MacNeille
patent: 4105303 (1978-08-01), Guyton
patent: 4408846 (1983-10-01), Balliet
patent: 4618231 (1986-10-01), Genco et al.
patent: 5237351 (1993-08-01), Kohayakawa et al.
patent: 5450145 (1995-09-01), Valentine
patent: 5675399 (1997-10-01), Kohayakawa
patent: 2004/0041980 (2004-03-01), Laguette et al.
patent: 1649802 (2006-04-01), None
International Search Report issued in PCT/IN2007/000483, mailed on Mar. 3, 2008, 3 pages.
Written Opinion issued in PCT/IN2007/000483, mailed on Mar. 3, 2008, 6 pages.

Affiliated with

Also associated with

Rating

Apparatus and method for subjective determination of the... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for subjective determination of the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for subjective determination of the... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2728781