yep, snakes can be made blind by putting too strong a light in their tank, especially albinos...
use a low wattage light, have it directly above the snake (as the sun would be) and remember that corn snakes are "crepascular" which means they come out in low light levels at dawn and dusk.. they are not designed to sit in bright light all day
only have the light on, when you want to see.. not day in day out when no-one is looking
or, use a red light, as reps can't see in red light..
whatever you use, make sure its guarded so the snake cannot get to it. even a low wattage tube light gets quite warm.
Nerys