NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Lunar distance accuracy
From: Michael Daly
Date: 2007 Oct 26, 01:34 -0400
From: Michael Daly
Date: 2007 Oct 26, 01:34 -0400
Greg R. wrote: >> One alternative explanation offered was that >> the eye pupil becomes larger in the darkness:-) > > Agreed - which would reduce the depth-of-field, but how exactly would > that improve the eye's resolution? A larger pupil exposes more of the cornea/lens to the light and allows more opportunity for astigmatism to come into the image. If you have generally good vision but off-axis astigmatism, it is not noticeable until the pupil is large. Larger pupils can also reveal early cataracts (they tend to start from the outside of the lens) that can mess up the image. These kinds of things start to show up in daylight for some folks who start using various eye medications that cause pupil dilation (like some glaucoma meds). Mike --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---