Edgar, Long ago I sought a great solution for UV and light filtering in bright conditions, in the deserts and high mountains where we carry out our observing at telescopes.
Our "day" there is not just "nighttime": we have tasks to do in sunny hours, too. Sleep hours are fewer than on sesshin. There's lots to do in the bright of day; and some of it may be recreational, up there. Certainly for exercise. I don't need corrective lenses, so I looked for off-the-shelf "shades", but those for use in climbing. The glacier-climbing glasses seemed to be the best optical "fit", for my hopes. So I tried the Julbo brand. This French outfit has been at it since 1895, and are pretty well respected; scans of the light filtration are available (not that we don't have technology to do that ourselves, but it's nice to have assurance up-front that the product may suit). See a low-cost entry in their catalog. I use a polarizing pair, but the "Sherpa" model has lenses that are even a little darker. The supple leather side-shields are effective in blocking what's called "fugitive-light". That's a very needed provision when a lens is so dark as these, because, when wearing them in bright conditions, the iris opens, and any fugitive light from sides, bottom and top can still enter the eye -- even if not to strike the retina -- powerfully, and begin the polymerization process of the lens of the eye, leading to nuclear (or worse) cataracts that we hope to avoid. For my use of these glasses, I carefully spray-painted the removable side-shields WHITE on their outside: who needs the extra heating when it's 115 degrees in the desert, downtown? Cooler up the Hill, though. The adiabatic lapse-rate of temperature is about 5 deg F for every 1000 ft of rise: a good rule-of-thumb. ;-) Yes, please see the inexpensive (and great) Julbo Sherpas: http://www.rei.com/product/826294/julbo-sherpa-glacier-glasses,-black,-smallpectron-3-plus?preferredSku=8262940001&cm_mmc=cse_froogle-_-pla-_-product-_-8262940001&mr:trackingCode=5C3F4BBC-FB91-E011-9A77-001B21631C34&mr:referralID=NA&mr:adType=pla&{copy:s_kwcid}=&gclid=CODyluSU6LMCFUjZQgodXV0AjA They stay on your face, too: curve-ended stems hold them on comfortably, a feature that's really a necessity if you do any climbing. Great for biking! This post is on-topic because these dark glasses are good for Zen students doing kinhin outdoors with the group on sesshin, some days in, when the eyes may be a little more sensitive. To LOWER the sensitivity of the eyes, just eat less of the medicinal or dietary Potato Leaves! All best, --Joe > Edgar Owen <edgarowen@...> wrote: > > Joe, > > My standard pair of glasses has polycarbonate lens which block almost all UV > much better than sunglasses. ------------------------------------ Current Book Discussion: any Zen book that you recently have read or are reading! Talk about it today!Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Zen_Forum/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Zen_Forum/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
