Objective measurement of eye refraction

A - Human Necessities – 61 – B

Patent

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A61B 3/103 (2006.01)

Patent

CA 2444644

A method for providing an objective manifest refraction of a patient's eye includes obtaining at least fourth-order Zernike wavefront aberration information, fitting a second--order only polynomial to the at least fourth-order data, and using this information to predict the patient's manifest refraction with an accuracy approaching the patient's subjective manifest refraction. A method is also described for prescribing an accurate vision correction based upon the objective manifest refraction. A display according to the invention includes higher-order wavefront aberrations, lower order wavefront aberrations, numerical indicia of predicted manifest refraction, and images of qualitative assessments of a patient's vision quality. A device for obtaining an objective manifest refraction is described.

L'invention porte sur un procédé d'obtention d'une réfraction manifeste objective de l'oeil d'un patient comportant les étapes suivantes: obtention d'une information d'aberration de front d'onde de Zernike de quatrième ordre au moins; application d'une fonction polynomiale de second ordre seulement aux données de quatrième ordre au moins; et utilisation de cette information pour prévoir la réfraction manifeste du patient avec une précision approchant celle de la réfraction manifeste subjective du patient. L'invention porte également sur un procédé de prescription d'une correction précise de la vision basée sur la réfraction manifeste objective, sur un afficheur des d'aberration de front d'onde d'ordre élevé, des d'aberration de front d'onde d'ordre inférieur, du coefficient numérique de la réfraction manifeste prévue, et des images d'estimations qualitatives de la qualité de vision; et sur un dispositif d'obtention de la réfraction manifeste objective.

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