Bausch-lomb Incorporated

Technolas Gmbh Ophthalmologische Systeme

Christoph Sappel

Gerhard Youssefi

Hans-Joachim Polland

Kristian Hohla

Ernst Hegels

Stefan Seitz

Birte Jansen

Stefan Franzke

Joachim Polland

A selectively marked contact lens having, in one aspect, marks in an optical zone region on a surface thereof and, in another aspect, different marks outside an optical zone region of the lens, for an in-vivo lens. With the lens in-vivo, the subject's eye is illuminated and the lens is imaged. A fast algorithm is used to determine the mark coordinates in relation to a measured pupil coordinate to determine position and/or orientation of the contact lens. A wavefront aberration measurement can also be obtained simultaneously with the contact lens position measurement, as well as pupil size. A fast algorithm provides for online measurements; i.e., at a repetition rate of 10 Hz or greater, over a selected time interval. Blinking periods are determined and anomalous lens position and/or wavefront information is discarded. A most frequently occurring wavefront and/or contact lens position/orientation is determined over the selected time interval.

Method and apparatus for online contact lens evaluation

An improved wavefront sensor is provided that enhances the initial focus and precision of imaged spots used to determine the monochromatic wave aberrations of the eye. The wavefront sensor includes an adjustment camera that is independent of a lenslet camera. A laser in a lower power mode is projected onto the retina of the eye and is brought into more precise or sharp focus by a control system employing data from the adjustment camera, which aids in focusing the imaged spots. 'Trombone'-type optics are used to adjust the focus of the light projected onto the retina and the imaged spots onto a sensor. The laser has a higher power mode used when acquiring data of the imaged spots from the sensor.

Wavefront sensor having multi-power beam modes, independent adjustment camera, and accommodation range measurement

Wavefront sensor having multi-power modes, independent adjustment camera, and accommodation range measurement

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Grunwald, Germany

Christoph Sappel