What are the symptoms of HPPD?
HPPD subjects experience a wide range of visual disturbances. These disturbances are the result of changes in the way that the brain processes visual information. It is important to realize that many of these visual disturbances are present to some degree in healthy people. For example, most people will see points of light, “floaters”, and other visual effects if they stare at a blue sky or brightly lit white surface for several minutes. Everybody sees shapes in clouds or see halos around lights at night. These things are normal. What differentiates the medical condition of HPPD from normal visual ‘noise’ is the severity of these effects. HPPD subjects have these effects with sufficient frequency and severity that it interferes with their ability to function in their daily lives. HPPD symptoms vary widely in severity and frequency. In mild cases, HPPD is little more then an occasional annoyance. In severe cases subjects report a wide range of the symptoms listed below on an ongoing bas
