Some individuals simply see better in the dark. Others always need some illumination to see.[I remember someone who was amazed that I could look up the chart number in my Uranometria atlas with only the light from the sky--he couldn't see the black ink on the page and could barely make out the outline of the book. We were both amazed at each other's vision. ]
Still, Mauro's logic is inescapable. I suspect the truth lies somewhere between the conclusions of the researchers and the experience of astronomers. But how to set up a test........
My night vision has always been superb (even at 60); it's my day vision that sucks.
-------------------- Mr. Bill
Oberwerk 100BT 45 degree + Hercules fork mount
15x70 AP binos + Paragon p-mount
120mm f/5 Orion achromat + Moonlite focuser
140mm f/5.7 Vixen NeoAchro Petzvel refractor
150mm f/6.5 Antares achromat
150mm f/8 "bent" homemade achromat
8 inch Orion newt with f/5 Swayze mirror
10 inch f/4.7 Orion newt + Paracorr
15 inch f/5 Discovery split tube
26mm Nagler, 17mm Nagler, 13mm Ethos, 8mm Ethos
Member IDA
"Life's too short to look through "almost as good" eyepieces"