Primary spheroidal degeneration of the cornea in Labrador and northern Newfoundland.

The reported prevalence and severity of primary spheroidal degeneration in Labrador and nothern Newfoundland is based on a survey of 929 patients. The degeneration is associated with man in outdoor occupations and with pinguecula, but not with glaucoma. Ultraviolet radiation is a probable causative factor and prophylaxis using appropriately filtering glass a possibilty.