Grand Rounds for today is an interesting finding of an anomalous congenital blood vessel that crosses the front of a pupil, relaxing when the pupil is small, and pulling taut when the pupil becomes is dilated. The image above is relaxed with a small pupil.
This image shows a wider view with a constricted pupil and relaxed vessel. The patient presented with a congenital vessel that extended from the temporal surface of her right iris across the pupil to the nasal surface.
The vessel would relax, or become taut as her active pupil altered in size. It had no discernable effect on her visual acuity, although she had a sense of movement in her vision when she was in strong sunlight.