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I sometimes would want to read in very dark conditions without using a light that will mess with my night vision. On occasion I actually just close one eye to maintain night vision in it. That can cause problems because in the dark the eye that was exposed to the light may have a residual halo effect in it.
A flashlight or lamp has a bright bulb usually and can be a problem if the eye catches the bulb. A screen that can be dimmed isn't as bad, and this might come under that heading.
Anyway, I would like to try it. It would be really neat if it could be manufactured as a add on for the old Kindles.
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