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I figured I would start a new thread with this topic. For anyone who didn't 
catch them, there are a number of messages in the thread on "computing 
sunrise/sunset" which deal with the question of damage to the eyes from 
looking at the Sun particularly through a sextant telescope or binoculars. 
This has been a popular topic in the past on NavList. Try searching the 
NavList archives for the word "retina". Here's a link to that search:
http://www.google.com/search?q=retina&sitesearch=fer3.com

Here's an external link that fits well with my understanding of the issue, at 
least with respect to eclipses:
http://www.straightdope.com/columns/read/2585/will-looking-directly-at-a-solar-eclipse-make-you-go-blind

Just as a general un-scientific survey, how many of you have caught a quick 
glimpse of the Sun through a sextant telescope? How long did it take for the 
spots to go away. I have done so on several occasions, and while a spot in my 
vision once lasted for more than a minute, it's never been worse than that. 
Of course, these are quick glimpses of the Sun which immediately triggered my 
reflex to look away.

-FER



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