Ophthalmic instrument and method of making ophthalmic determinat

Details Ophthalmic instrument and method of making ophthalmic determinat Ophthalmic instrument and method of making ophthalmic determinat

1994-10-26

1996-04-30

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351212, 351214, 351211, A61B 310

Patent

active

055129650

ABSTRACT:
An ophthalmic instrument, in the nature of a pachymeter or densitometer, and which is used for ascertaining the thickness and relative optical density of the cornea of the eye on a real time basis. The instrument comprises a television camera and a multiple Scheimpflug corrected slit projector and an associated processing and display system. A number of digitally encoded television images of the optical section of the cornea are subjected to digital analysis. A density map may be constructed from the data derived in the digital analysis and produced for display either by a printer or display member. The display may be a three-dimensional plot of the frontal surface shape, local thickness, posterior surface contour and optical density of the cornea. A method of using the ophthalmic instrument and of making ophthalmic determinations is also disclosed.

REFERENCES:
patent: 4523821 (1985-06-01), Lang et al.
patent: 4711541 (1987-12-01), Yoshino et al.
patent: 5341180 (1994-08-01), Isogai et al.

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