Cornea shape measurement apparatus

Details Cornea shape measurement apparatus Cornea shape measurement apparatus

2010-09-29

2011-12-20

Pinkney, Dawayne (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S200000, C351S205000

Reexamination Certificate

active

08079709

ABSTRACT:
A cornea shape measurement apparatus outputs data useful for prescription as well as injection and installation of a TORIC-IOL. This apparatus includes: a projecting optical system projecting an index for measurement onto a cornea; an illuminating optical system illuminating an anterior segment on which a reference mark is placed; an imaging optical system capturing an anterior segment image containing the reference mark and an image of the index reflected from the cornea; an image processor overlaying an astigmatic axis mark indicating a direction of an astigmatic axis of the cornea, which is calculated based on the index image, on the anterior segment image; and a controller displaying the anterior segment image, which contains the astigmatic axis mark, on a display.

REFERENCES:
patent: 5549596 (1996-08-01), Latina
patent: 6755528 (2004-06-01), Isogai
patent: 2005/0107775 (2005-05-01), Huang et al.
patent: 2010/0060855 (2010-03-01), Graether
patent: 2010/0225014 (2010-09-01), Bille

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