Apparatus and method for determining sphere and cylinder...

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type

Reexamination Certificate

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C351S210000

Reexamination Certificate

active

07461938

ABSTRACT:
An apparatus for determining spherical and cylinder components of subjective refraction of a patient's vision includes a wavefront measurement device that can produce a measure of quality of vision in a return beam from the patient's eye viewing a target through a corrective test lens in the apparatus. The corrective lenses may be varied and a plurality of measurements of quality of vision may be obtained and analyzed to determine the spherical and cylinder components. Accordingly, the eye examiner may conduct a refraction examination without a subjective response from the patient.

REFERENCES:
patent: 6499843 (2002-12-01), Cox et al.
patent: 6786602 (2004-09-01), Abitbol
patent: 2003/0151721 (2003-08-01), Lai et al.
patent: 2005/0057723 (2005-03-01), Wakil et al.
Cheng et al., Journal of Vision (2004) 4:310-321.
Macrae et al., (eds.), “Customized Comeal Ablation The Quest For Super Vision,” Slack Incorporated (2001), p. 37.
Thibos et al., Journal of Vision (2004) 4:329-351.

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