system
Given the following post, respond as if you're commenting on Reddit:
human
[Green Lantern] When GL casts his constructs, what does an observer who's color blind to the green spectrum see?

Maybe I don't properly understand GL's ring or color blindness for that matter, but would someone who's unable to see the green spectrum see anything? Would there be an outline to the objects? Would the objects appear greyish if they're solidified light?
gpt
If they're colour blind, they'll be unable to discern the exact colour, so might see the constructs as red/orange.  

If they're unable to see green things are a bit more interesting - we humans have 2 light sensing cells in our eyes (cone, for colour and rod for absence/presence of light).  

Assuming the person is a human, if the cone cells werent stimulated by green at all, the very few rod cells in the middle of the eye (they're found in the highest concentration around the edges of the retina) would be telling the person that there was **something** in front of them, but it would be conflicting with the information from the cone cells, so they'd see constructs out of the corner of their eyes, and have a vague sense of something being in front of them.

If both the rod and cone cells were blocked from seeing the wavelengths associated with green lantern constructs, then it would be like invisible telekinesis to them.