Start here: Sun, Observation and eye damage - Wikipedia, the free encyclopedia
I found this interesting from that:
Quote:
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Viewing the Sun through light-concentrating optics such as binoculars is very hazardous without an appropriate filter that blocks UV and substantially dims the sunlight. An attenuating (ND) filter might not filter UV and so is still dangerous. Unfiltered binoculars can deliver over 500 times as much energy to the retina as using the naked eye, killing retinal cells almost instantly (even though the power per unit area of image on the retina is the same, the heat cannot dissipate fast enough because the image is larger). Even brief glances at the midday Sun through unfiltered binoculars can cause permanent blindness.
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I think what you're talking about, though, can lead to cataracts over the long-term. It's best to protect your eyes from extremities. The article says intense sun viewing can cause sunburn-like lesions in 100 seconds.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
Last edited by Baraka_Guru; 01-15-2009 at 08:18 AM..
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