Cold Weather Goggles. 3. Resistance to Fogging

Twelve pairs of goggles designed to protect the eyes from conditions in the cold were tested for their tendency to fog while being worn during strenuous exercise in very low temperatures. Subjects reported the visibility of targets of various contrasts during 15-minute periods of exercise. The times at which the different targets became invisible were recorded. There were wide differences between the goggles in their resistance to fogging as revealed by the ability of the subjects to detect the lowest contrast target these differences declined as target contrast increased. In general, goggles advertised by the manufacturers to be resistant to fogging performed well and were better than goggles by the same manufacturer not so advertised.