• Optics express · Nov 2012

    Comparative Study

    First-order design of a reflective viewfinder for adaptive optics ophthalmoscopy.

    • Alfredo Dubra and Yusufu N Sulai.
    • Department of Ophthalmology, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA. adubra@mcw.edu
    • Opt Express. 2012 Nov 19;20(24):26596-605.

    AbstractAdaptive optics (AO) ophthalmoscopes with small fields of view have limited clinical utility. We propose to address this problem in reflective instruments by incorporating a viewfinder pupil relay designed by considering pupil and image centering and conjugation. Diverting light from an existing pupil optical relay to the viewfinder relay allows switching field of view size. Design methods that meet all four centering and conjugation conditions using either a single concave mirror or with two concave mirrors forming an off-axis afocal telescope are presented. Two different methods for calculating the focal length and orientation of the concave mirrors in the afocal viewfinder relay are introduced. Finally, a 2.2 × viewfinder mode is demonstrated in an AO scanning light ophthalmoscope.

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