Monthly Archives: July 2017

It has been a busy season.  I have neglected to keep up with posting.  Whenever I have time to write, I have been working on a second book on Low Vision. For the next couple of weeks I will be posting topics from my book Insight into Low Vision.  This excerpt is from the chapter titled Interesting (Not Totally Understood) Phenomenon.


This phenomenon varies from a flash of light to moving patterns of light.  These lights appear randomly with no other visual associations.  It can occur in one eye or both eyes. They have been seen by those with retinitis pigmentosa , age-related macular degeneration, and Stargardt’s Disease.

Photopsia should be differentiated from light flashes associated with retinal detachment or traction on the retina.  These are both active processes that can be a sign of potential vision loss.  Photopic visual experiences, are thought to be residual neurological activity, as they occur in the area of retina which is already damaged.  This would be analogous to the phantom pain experienced by those who have lost a limb.