Photinos Panas (1832-1903) was one of the world's most important ophthalmologists in the second half of the 19th century. In his leading work entitled, Traité des maladies des yeux (Treatise of ophthalmic diseases), he made an in depth analysis of the various types of ocular cancer. His ideas on the subject were important for their tutorial character, their connection to the clinical work and very helpful for the everyday clinical practice of physicians of that time.