Color blindness is when you don't know what color something is and night blindness is when you can't see well at night from the dark.
How are their situations similar? Well both were tricked by their family. Lear by his daughters (Goneril and Regan) and Gloucester by Edmund. It took them both awhile to see what their children were...
there are 1000005000 kinds of blindnesses
Blindness is lack of vision in your eyes. There is such thing as being blind in one eye, but that's very rare.
my dad