When it comes to vision, the sun is packing heat, so your sunglasses need to do more than just look good

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me@rescam.org

Though I think that the carcinogenic influence of UV rays is massively overrated (like all of the other carcinogens - imo most influence is one's own DNA, else everyone would have cancer which isn't the fact) this article sure has a point.

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Account frozen...

The dermatologist just removed two little squamous cancers from my head. UV light DOES hurt, and I believe on a delayed action. That doctor told me to wear a hat when going out in the sun (even at sunrise - that SOUNDS but maybe is not ridiculous. It needs more research to verify). I read, about 6-10 years ago, in "Sky and Telescope" that the atmosphere filters out 99.6% of the "B rays" (but still that's a damaging dose left over). Later I read that essentially all the "C" rays but not so much of the "A" rays are filtered out. Research is needed to find out and which type of rays hurt. Also I read that clouds don't filter out ultraviolet very well. More research is needed. I believe it's the ozone about 20 miles (32 kilometers) up that does the filtering. Don't know whether any other wavelength hurts or not. This ultraviolet is in the 250 to 400 nanometer range, I understand.

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Since I was 16 I have had color changing lenses in my glasses, they are very comfortable. I never forget my sunglasses because I am wearing them all the time. It's very nice also in the winter time with the white snow, which is very hard for the eyes, or even in light but cloudy weather.

The last pair of lenses I got are of a very good quality, they change color within only a few seconds, and changing back doesn't take long either.

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"I'm trying to maintain a shred of dignity in this world." - Me

I believe it's the ozone about 20 miles (32 kilometers) up that does the filtering.

Maybe we should stop destroying it... ;)

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It may not be 1984 but George Orwell sure did see the future . . .

I believe it's the ozone about 20 miles (32 kilometers) up that does the filtering.

Maybe we should stop destroying it... ;)

That would show that we have common sense though ;-)

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I am 66 years old and had my cataracts removed 6 months ago. I have lived in the southern parts of the United States most of my live. I have worn glasses most of my life and carbonate lens are able to block UV rays. The books that they gave me at the clinic said that we will all get cataracts if we live long enough.

The upside is that I have always been nearsighted. When they remove a cataract it is neccessary to insert new lens. They gave me the choice of distance, close, or one of each. I chose distance in both eyes, and now feel that I can see better that I ever did. I do have have to use reading glasses and I find that I have a greater need for sun glasses in bright light.

The new proceedures are amazing the surgery took about 5 minutes, When they were finished I left the clinic with a piece of tape on my eye lid to keep it closed because, when they numbed my eye, the lid could not blink. After several hours I was able to remove the tape and had greatly improved vision in the eye that was treated. (They treat one eye at a time.) I had to use eye drops every several hours for a number of weeks, but the process is relatively painless.

I have noticed that my vision has improved to the point that I am able to enjoy reading and girl watching once again. Take care of you eyes they an amoung your most valuable assets.

Pellinore

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When it comes to vision, the sun is packing heat, so your sunglasses need to do more than just look good

An interesting article but with some errors.
The accepted requirement for sunshine is full body exposure for 20 minutes per day.

Many, many people are lacking sufficent vitamin D.
This lack of vitamin D causes a huge number of problems, including cancer.

Even here in Australia you don't get enough vitamin D from the suns UV during the winter months.

Ref 1

Ref 2

Ref 3

So sunnies are a very good idea but it's best not to limit exposure to the sun too much unless you're willing to take a vitamin D supplement.

After all, lets not forget that we evolved naked in the tropics.

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Qunpu' lo'taHmo' jIH yItamQo'

I've come down with a nasty case of rickets. Please everyone, pray for me.

I hope it clears up over the weekend. :-P

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Founder of BOINC team Objectivists. Oh the humanity! Rational people crunching data!
I did NOT authorize this belly writing!