Recently I have been having bouts of light blindness. You may have experienced light blindness when looking directly in to a headlight of a car at night, or some other similar incident. Normal light blindness only lasts for a few minutes.
Stress related light blindness can effect a person for as much as a few hours.
The treatment I have been using after having these bouts of light blindness, is to seclude myself in to a quiet room until I mentally relax. This normally helps the symptoms subside.
Light blindness can also be a symptom of an oncoming migraine headache. In these cases they most likely will be followed by a very bad headache. Luckily I have not experienced the migraines.