Fig. 3. Video frames captured during binocular recording from subjects 2 (top) and
3 (bottom). The right eye is on the left side of the image, left eye is on the right side.
The black line down the center is the edge of the knife edge mirror used to redirect
light to the left eye. The left eye image is mirror reversed and appears slightly
darker, due to light losses from suboptimal alignment and focus, and the additional
mirror in the left eye path. Halfway down the frame in the top image a horizontal
saccade occurred, producing a shear distortion that is symmetric due to the mirror
reversal of the left eye image. The field size was 2 and the imaging was centered at
4 in the upper visual field. Cone photoreceptors are clearly visible at this
eccentricity even without wavefront correction by adaptive optics.