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When I image I always have a very dark perspex on my laptop. After a while my eyes get used to the dark (couple of hours) and I can lookup or tweak stuff around the scope even without a torch. If I walk around the field and come across other imagers with unshielded laptop my eyes hurt so I can't even look straight at them. So I guess after a few hours your eye must be used to the dark. Maybe the older you are the less flexible they become. The more time it takes to adapt. Everybody's different I guess. But I've used red lights and shields for years now and haven't looked back. Makes it a lot easier for me to function properly around the scope and enjoy the sky at the same time.
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