Patent ID: 9004690
Filing Date: 2015-04-14
Classification: A61B

Abstract:
1. An ophthalmological method for measuring a cornea, comprising: phase-shifting of a periodic basic reference pattern that is defined by a modulation profile to generate a plurality of mutually phase-shifted reference patterns; generating a two-dimensional reference pattern from the plurality of mutually exclusive phase-shifted periodic basic reference patterns; projecting the two-dimensional reference pattern onto the cornea; acquiring a reflection pattern reflected by the cornea by virtue of the two-dimensional reference pattern; storing a plurality of different reflection images produced from the same reflection pattern reflected by the cornea by virtue of the two-dimensional reference pattern, the reflection images corresponding to the phase-shifted reference patterns; measuring intensities in the plurality of different reflection images at a pixel corresponding to a point on the cornea having first three-dimensional coordinates on the cornea; calculating for the point on the cornea having the first three-dimensional coordinates on the cornea a phase value of the reflection pattern on the basis of the intensities measured in the plurality of different reflection images; and determining at least one measured geometric value of the cornea on the basis of the phase value.