Night Vision?
Your do know a little bit about night vision, right? If not, please research the subject just a bit.
Most pilots tend to keep light levels low in darkness for reasons that you will learn. During daylight, obviously displays and ambient light are higher. Do some homework and you'll get it. As far as I know, most pilots prefer dim interior lighting at night, giving them a better opportunity to spot intruders in their airspace. Please, read about visual acuity, night vision, rods and cones - and age-based vision changes. If you are over - even 35, some of it will compute.
A few will always dispute this kind of response, "I can see just fine." Next time they sit for a vision exam, they may have a surprise. Wearing lenses - or having them available is not a sin; If you need them, use them! And yes, keep the interior light as low as possible as night.