Symptom-producing, or pathological,<unk> ta may be due to a wide range of disease processes, affecting any part of the visual system, including the retina (in particular its most sensitive portion, the macula), the optic nerve and even the visual cortex. A pathological<unk>  may involve any part of the visual field and may be of any shape or size. A<unk>  may include and enlarge the normal blind spot. Even a small<unk>  that happens to affect central or macular vision will produce a severe visual disability, whereas a large<unk>  in the more peripheral part of a visual field may go unnoticed by the bearer because of the normal reduced optical resolution in the peripheral visual field.
Scotoma
Tar melanosis
Apudoma
Cementoma
Ocular melanosis
Bowenoid papulosis
Melasma
Erythrasma