Students and researchers studying eye diseases might want to focus on this new pathology collection from the U.S. National Eye Institute (NEI). The database presents 1040 case descriptions of eye illnesses, injuries, and disorders gathered by the late David Cogan, an ophthalmologist at Harvard Medical School and NEI. Examples range from cataracts to a parasitic worm infestation of the retina. Featuring more than 3000 photos, the collection is particularly strong on certain topics such as the retinal degeneration spurred by diabetes. You can search the cases by location in the eye, diagnosis, and type of tissue abnormality.