File:Iridology iris eye chart right mirror.jpg - Wikipedia
E chart - Wikipedia
Autostereogram - Wikipedia
File:ETDRS Chart R.svg - Wikipedia
Focus On: Ophthalmology: Goggles, Cataract, Human Eye, Visual Acuity, Ocular Prosthesis, Snellen Chart, Sunglasses, Eyeglass Prescription, Field of View, Pupillary light Reflex, etc. eBook : Wikipedia contributors