Wide field of view scanning laser ophthalmoscope

A - Human Necessities – 61 – B

Patent

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A61B 3/12 (2006.01) A61B 3/14 (2006.01)

Patent

CA 2251097

A scanning laser ophthalmoscope (10) with a wide field of view provides a color image of an interior portion of a patient's eye at varying depths while the patient is simultaneously presented with a fixation target designed to probe his visual function. The scanning laser ophthalmoscope (10) includes an illumination system (30), a capturing and detection system (32) and a target image generating system (38) wherein the optical paths of each of these system is separated by one or more beam splitters to prevent a chief ray from the patient's eye from being blocked so as to eliminate shading off effects in the captured image. A simplified scanning system is employed that includes only one scanner with a moveable reflective surface. A passive, stationary optical element (74) is employed to generate a line of light (76) from a point of light that impinges on the optical element, the line of light being scanned in a direction perpendicular to the line by the single scanner.

Un ophtalmoscope laser à balayage (10) ayant un large champ de vision donne une image en couleur de la partie interne de l'oeil d'un patient à différentes profondeurs, pendant que l'on présente au patient une cible de fixation destinée à évaluer sa fonction visuelle. L'ophtalmoscope (10) comporte un système d'éclairage (30), un système de capture et de détection (32) et un système de génération d'image cible (38). Les trajets optiques de ces différents systèmes sont séparés par un ou plusieurs diviseurs de faisceau, de façon à ne pas bloquer un rayon principal venant de l'oeil du patient, ce qui évite les effets d'extinction au niveau de l'image capturée. Un système de balayage simplifié comprend un seul dispositif de balayage ayant une surface réfléchissante mobile. Un élément optique passif fixe (74) génère à partir d'un point lumineux une raie lumineuse (76) qui tombe sur l'élément optique, la raie lumineuse étant balayée par le dispositif de balayage selon une direction perpendiculaire à elle.

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