Slit lamp photomicrograph showing full iris transillumination in a patient with OCA1A. The light is reflected from the retina and choroid back through the iris. The circular outline is the image of the lens that is posterior to the iris. Radial iris vessels are easily seen.
OCA1A: oculocutaneous albinism type 1A.
Reproduced from: Summers CG, Knobloch WH, Witkop CJ Jr, King RA. Hermansky-Pudlak syndrome: Ophthalmic findings. Ophthalmology 1988; 95:545. Illustration used with the permission of Elsevier Inc. All rights reserved.