Ophthalmologic curvature measuring device and method to conjoint

Details Ophthalmologic curvature measuring device and method to conjoint Ophthalmologic curvature measuring device and method to conjoint

1997-04-10

1998-11-10

Dang, Hung X.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351221, 351247, A61B 310, A61B 300

Patent

active

058351906

ABSTRACT:
An ophthalmologic curvature measuring device measures the shape of a central portion and the shape of a peripheral portion of a curved surface such as a cornea of the eye or contact lenses. The measuring device has a small size and is capable of being hand held during measurement. A plurality of light beams are first projected onto the cornea and corneal periphery of the eye. A first projection unit then projects a first mark onto a first region of the subject eye while a second projection unit projects a pair of second marks onto a second region of the subject eye. An objective lens transmits reflected images of the first and the second marks to a measurement unit which measures the second marks at first and second timings. A displacement detecting unit then detects relative angular displacement of the measured first and second positions of the second marks about an optical axis and a calculation unit calculates the second region of the subject curved surface from the relative angular displacement detected by the displacement detecting unit.

REFERENCES:
patent: 4572628 (1986-02-01), Nohda
William F. Long, A Matrix formalism for Decentration Problems, vol. 53, No. 1, Jan. 1976, pp. 27-33.

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