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Overview of the optical system used in the study; sketch (A) and real image (B). Two Fresnel lenses, F1 and F2 (both 10.16 cm focal length and diameter), were placed at twice their focal length apart. Red and blue LEDs were placed at one end of the optical system. The subject’s dilated right eye was aligned at the other end, while the undilated left eye was recorded by the infrared camera (IR camera) attached to the computer. The diffuser had a 5 deg diffusing angle.
