QUOTE(Axon @ Mar 31 2006, 07:20 PM)
A friend of mine just saw the eclipse in Egypt. He says it's utterly unforgettable.
The corona is safe, but apparantly it is unsafe to view the partial eclipse right before/after totality. The pupils are dilated due to the reduced light so that the risk of blindness is much higher than even staring at the sun normally. (From what I've read.)
You are absolutely right. Hardcore corona observers actually close they eyes 4-5 minutes prior to the totality, in order to allow the pupils to dilate to the maximum.
This time round the totality took more than 3 minutes in Turkey, which is enough time for the pupils to adjust.
However some total eclipses only have a duration less than 2 minutes, which is too short a time for the eyes to adjust properly.
When the core shadow passes at the 3rd contact and the first rays of the sun hit you after the totallity the intensity is immense.
You have 1-2 seconds to put on your eye protection if you do not want to damage your sight.
I must admit I took a few seconds longer before putting on my eye protection, as if I couldn't get enough.
BTW you will have total solar eclipses in the US, both in 2017 and 2024. I don't know the duration of the one in 2017, but the one in 2024 will have a duration above 4 minutes.
Expect to find me there.