Toric intraocular lens measurement apparatus and method

摘要

An apparatus for determining the angular error in the placement of fiducial marks on a toric intraocular lens with respect to the true location of a meridional axis of the intraocular lens, the fiducial marks defining an estimate of the angular orientation of the meridional axis of the intraocular is disclosed. The apparatus includes a rotatable intraocular lens holder coupled to drive assembly and an actuator which are mounted into an optical measurement cell receptacle of a wavefront measuring instrument or an angular error measuring instrument. A method for determining the angular error in the placement of fiducial marks on a toric intraocular lens with respect to the true location of a meridional axis of the intraocular lens is also disclosed.

主权项

1. An apparatus for determining the angular error in the placement of fiducial marks on an intraocular lens with respect to the true location of a meridional axis of the intraocular lens, said fiducial marks defining an estimate of the angular orientation of the meridional axis of the intraocular lens, the apparatus comprising:
a. a rotatable intraocular lens holder adapted to mount the intraocular lens and rotate the intraocular lens about its optical axis; b. a drive assembly coupled to the rotatable intraocular lens holder adapted to rotate the intraocular lens mounted in the rotatable intraocular lens holder without changing the location of the optical axis; c. an optical measurement cell configured to hold the intraocular lens mounted in the rotatable intraocular lens holder; d. an optical measurement cell receptacle configured to receive the optical measurement cell and its contents; e. a wavefront measuring instrument having a principal axis defining a fixed coordinate system; the wavefront measuring instrument further comprising a light source and a wavefront sensor; the light source being configured to emit a beam of light directed along an illumination axis passing through the optical measurement cell receptacle and its contents and onto the wavefront sensor, the wavefront measuring instrument being adapted to measure wavefront deviations due to the presence of the intraocular lens; f. an optical feedback sensor configured to view the orientation of the fiducial marks on the intraocular lens with respect to the principal axis of the wavefront measuring instrument; g. an actuator coupled to the drive assembly and operable to rotate the intraocular lens about its optical axis so that the fiducial marks of the intraocular lens are aligned with the principal axis of the wavefront measuring instrument using the optical feedback sensor; and h. a processor including an algorithm executable to process the wavefront deviations due to the presence of the intraocular lens in the optical measurement cell receptacle and calculate the angular error in the placement of the fiducial marks with respect to the true location of the meridional axis of the intraocular lens.