[JANALA]

I'm lazy tonight and don't feel like typing the physiological reasons, so instead I spent 45 seconds to google this.

http://southernfocusvision.com/pdf/sun.pdf

There is nothing in that article that says contact lenses let more light into your eyes... in fact the only reference is "Soft contact lenses provide very little protection" which is in the context of whether glasses provide protection or not.