Common symptoms include pain, intense tears, eyelid twitching, discomfort from bright light,[1] and constricted pupils.
This is especially a problem in polar regions and at high altitudes,[5] as with about every 300 m (980 ft) of elevation (above sea level), the intensity of ultraviolet rays increases by four percent.
[12] The SAS Survival Guide recommends blackening the skin underneath the eyes with charcoal (as the ancient Egyptians did) to avoid any further reflection.
Robert Falcon Scott favoured a more rudimentary approach, opting for goggles crafted from leather or wood with narrow slits, which prevented the accumulation of frost.
The Royal Geographical Society's guidance for travellers included a technique used by indigenous peoples of high-altitude regions, which involved darkening the skin around the eyes and nose to mitigate the risk of snow blindness.
Similarly, mules were provided with canvas snow goggles, demonstrating the breadth of strategies developed to combat this pervasive issue during polar exploration.
Nonsteroidal anti-inflammatory drug (NSAID) eyedrops are widely used to lessen inflammation and eye pain, but have not been proven in rigorous trials.
Further injury should be avoided by isolation in a dark room, removing contact lenses, not rubbing the eyes, and wearing sunglasses until the symptoms improve.