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Abstract

A retinal imaging device is provided comprising an optical stage, one or more illumination sources, an optical system, a position-sensitive optical tracking sensor, a retinal image sensor, and a tracking controller. The illumination sources are configured to direct an illumination beam onto a cornea of an eye under examination where the illumination beam undergoes both specular and diffuse reflection. The position-sensitive optical tracking sensor comprises a non-image forming sensor configured to generate a signal indicative of the relative positioning of relatively low and high intensity portions of an optical signal incident on the sensor, in at least two dimensions. The optical system is configured to direct diffuse reflections from a cornea of an eye under examination to an input face of the position-sensitive optical tracking sensor and the tracking controller is configured to utilize an intensity distribution signal from the position-sensitive optical tracking sensor to control an optical alignment function of the optical stage, relative to a cornea of an eye under examination.

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