If you are exposed, unprotected, to excessive amounts of UV radiation over a short period
of time, i.e. a tanning booth without protective eyewear, you are likely to experience an
effect called photokeratitis. Like a "sunburn of the eye" it may be painful and you may
have symptoms including red eyes, a foreign body sensation or gritty feeling in the eyes,
extreme sensitivity to light and excessive tearing. Fortunately, this is usually temporary
and rarely causes permanent damage to the eyes.