Device and method for mapping objects

G - Physics – 01 – B

Patent

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G01B 11/24 (2006.01) A61B 3/107 (2006.01) G01B 11/255 (2006.01)

Patent

CA 2184108

This invention provides a method and apparatus for mapping the surface of an object, in particular, a transparent object such as anterior and posterior surfaces of a patient's cornea, in a clinically useful time using a single optical system. In a preferred embodiment, a pattern generator (12) projects a pattern of light and dark areas onto a patient's cornea (18), and a light detector (14) receives patterns reflected from the anterior and posterior surfaces (24, 28) of the cornea. A mapping means (16) generates a three-dimensional map of the anterior and posterior corneal surfaces (24, 28) from information regarding the projected and detected light patterns. The invention can be used to map other objects such as a contact lens or an intraocular device, e.g., an intrastromal ring. The invention can also be used to map the surface of an opaque object.

Procédé et dispositif de mappage de la surface d'un objet, notamment d'un objet transparent tel que les surfaces antérieure et postérieure de la cornée d'un patient, au moment souhaité, à l'aide d'un seul système optique. Dans un mode d'exécution préféré, un générateur de motifs (18) projette un motif lumineux et des zones sombres sur la cornée du patient (18) et un détecteur de lumière (14) reçoit les motifs réfléchis par les surfaces antérieure et postérieure (24, 28) de la cornée. Un organe de mappage (16) génère une carte tridimensionnelle des surfaces antérieure et postérieure (24, 28) de la cornée à partir d'informations relatives aux motifs lumineux projetés et détectés. On peut utiliser cette invention pour mapper d'autres objets, tels que des lentilles de contact ou un dispositif intraoculaire, par exemple un anneau intrastromal. On peut également l'utiliser pour mapper la surface d'un objet opaque.

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