1. It's not all about eyes. The skin also reacts to light. 2. Even though your pupil shrinks, you get a larger total number of light rays into the eye. Your vi

1. It's not all about eyes. The skin also reacts to light. 2. Even though your pupil shrinks, you get a larger total number of light rays into the eye. Your visual cortex adjusts the image so you don't realize that a sunlit scene is a million times brighter than a lamplit scene. These extra rays may still affect something hormonal.