Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1996-08-30
1998-10-13
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351246, A61B 310
Patent
active
058220356
ABSTRACT:
A system and method for the in-vivo measurement of optical characteristics of a cornea includes an ellipsometer which measures the phase shift in reflected light after it has passed through the cornea or been reflected from the retina. This ellipsometer has a polarizing unit which selectively irradiates the cornea with light having one of four preselected linearly independent states of polarization (irradiation states). For each irradiation state, an analyzing unit in the ellipsometer selectively detects reflected light with one of four preselected linearly independent states of polarization (detection states). With the consequent sixteen ellipsometer measurements, a Muller matrix is generated which reveals the birefringent characteristics of the portion of the cornea through which the light passed. These measurements are then used in determining the birefringent characteristics of the cornea. Alternatively, birefringent properties of the deeper retinal layers can be determined.
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Dang Hung X.
Heidelberg Engineering Optische Messysteme GmbH
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