Imagine Optic

Imagine Eyes

Xavier Jean-François Levecq

Fabrice Harms

Nicolas Chateau

Samuel Henri Bucourt

A method for correcting aberrations of the eye applied to an ophthalmic instrument operating with an analysis light beam, including: measurement of aberrations of the eye capable of interfering with the analysis beam, correction of the phase of the wave front of the analysis beam as a function of the measured values of the aberrations, measurement of eye movements carried out independently of the measurement of aberrations, and modification of the correction of the phase of the wave front of the analysis beam as a function of the measurement of eye movements.

Method and system for correcting aberrations of the eye for an ophthalmic instrument

A method for measuring, in a given plane, the scattering of an optical system, including:

Method and device for measuring the local scattering of an optical system

A wavefront analysing device, of the Hartmann or Shack-Hartmann type, comprises in particular a set of sampling elements arranged in an analysis plane, and forming as many micro-lenses for sampling the incident wavefront, and a diffraction plane wherein are analysed the Airy discs of the different micro-lenses illuminated by the incident wavefront. The shape of each micro-lens is such that the associated diffraction figure has in the diffraction plane one or several preferential axe(s), and the microlenses are oriented in the analysis plane such that the preferential axe(s) of the diffraction figure of a micro-lens are offset relative to the preferential axes of the diffraction figures of neighbouring micro-lenses, thereby enabling to limit the overlapping of the diffraction figures.

Device for analysing a wavefront with enhanced resolution

A device for the analysis of an optical wavefront includes an array (ML) of microlenses (L ), and signal processing elements. Each mircolens (L ) defines a subaperature (Sp ), and focuses an elementary surface of the wavefront, intercepted by the subaperature, for forming a spot (T ) on the detector. For each subaperature (Sp ), a zone (Z ) of assumed localization of the spot is defined. The processing unit makes it possible to establish a measurement file associating to each subaperature the position of this spot. The structure of the array (ML) presents one or several local variations. By comparing the contribution of these local variations taken from the measurement file, with their contribution taken from a reference file, the displacement between the subaperature from which a detected spot is derived and the subaperature that defines the zone of assumed localization wherein the spot is located is measured.

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Gif sur Yvette, France

Xavier Jean-François Levecq