"Dim light disease" is a misperception that results from abnormality
within the visual cortex of the brain. Symptoms (equal and bilateral)
are:

1. False perception of dimness of light; normally bright light (e.g.
the sun) is peceived as MUCH dimmer. The day sky at 12:00 noon can
appears as bright as a 4-watt night-lamp would appear to the normal
eye.

2. Ability to perceive color and images with greater clarity as light
dims; colors and images can are best perceived in the absense of light.
The brighter the light the less clear images and colors are seen.

Pretty terrifying disease!!! Especially the dimness!!!!!!!