Photokeratitis or eye sunburn is a result of eyes being exposed to UV rays. These UV rays can be from the sun or other sources. UV rays from the sun can pass through the cloud cover and cause damage to the eyes even on cloudy days. UV rays from other sources such as welding or UV lights in laboratories can damage the eyes at any time. Photokeratitis or eye sunburn is a result of eyes being exposed to UV rays. These UV rays can be from the sun or other sources. UV rays from the sun can pass through the cloud cover and cause damage to the eyes even on cloudy days. UV rays from other sources such as welding or UV lights in laboratories can damage the eyes at any time.