For awhile, I thought my son had this.  What he did have was Right vision field blindness instead.  During my search, I found this site.  I find it fascinating that they used technology to give the typical viewer their experience.

 

After clicking the link, click on the boxes to "see" how they see.....

 

http://www.hale.ndo.co.uk/scotopic/index.htm 

 

Desiree