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--- home:lifestyle:light:eye_protection [01.03.2012] – external edit 127.0.0.1
+++ home:lifestyle:light:eye_protection [08.29.2012] – [Patients experiences] paulalbert
@@ Line 72: / Line 72: @@
 //**Cbay**, CureMyTh1.org// </blockquote>
-{{tag>light}}
+<blockquote>
+Welding glasses come in various shades denoted by numbers; #3 & #5 seem quite common. Permissible light transmission for each shade is governed by various standards (ANSI Z49.1-1967 in the US & EN169 in Europe).
+A few weeks ago I found out that the transmission of visible light for #3s should be 10-15%, and for #5s 1-2%, & reasoned that welding glasses would also have to block UV, IR & blue light - welding arcs are blue-white and hot.  But I wasn't able to confirm this.
+Today I found these figures from a US manufacturer (Elvex):
+UV protection 99.9%
+Blue light protection 99.7-99.9%
+IR protection 97.5%
+Visible light transmission #3: 10%, #5:1.3%
+(see http://tinyurl.com/y9e399o)
+This is significant because:
+a) welding glasses may offer equivalent (or only slightly inferior) protection to NoIRs.
+b) welding glasses are cheap (eg $7.49 for #3s here: http://tinyurl.com/yeozthu)
+c) NoIRs aren't available in China & would be considered expensive here. Lack of suitable/affordable eye protection could cause problems with the WCH trial. Welding glasses could fill this need.
+I understand that MPers develop varying degrees &/ types of light sensitivity. So until quite a few people have tried welding glasses it'll be difficult to know how well they work for us.
+But if you already have eye protection that works for you & feel like trying something different, here are some possibilities:
+- Elvex SG25-W3, SG25-W5 (Fitovers? PC mirror/NCB grey lenses offer less complete protection but might be OK for some; see link above)
+- Sperian Millenia 1006405 (#3) & 1006406 (#5) (Wraparound style - called Bacou-Dalloz in Europe I think)
+- In Europe: Lux Optical Visilux 60405 (#5* fitovers) /Soudlux 60820 (#5)
+I plan to try Millenia & Visilux models. If you try any welding glasses & have feedback about how well they work - especially compared to NoIRs (or whatever) - I for one would appreciate it.
+* Visilux 60404 transmits 3-8%, Visilux 60403 transmits 8-18% of visible light. These sound like #4s and #3s respectively, but the manufacturer's page doesn't explcitly state this anywhere I could find. See http://www.lux-optical.com ,"welding protection" & "the overglasses".
+Ok - for people in the US here are some online stores selling mainly wraparound styles in IR #5 (~2%), #3 (~10%) & #2 (~37%) from $6.15:
+http://www.safetyglassesusa.com/ir-protection.html
+http://www.safetyglassesinc.com/Safety-Glasses/Filtered-Safety-Glasses/
+http://www.discountsafetygear.com/safety-sunglasses-green.html
+If anyone finds sources of IR #5 fitovers, &/or links more convenient for people outside the USA please post them.
+Prescription lens wearers could use some Uvex products with a bit of help from an optician. "Rx inserts" are available for Uvex XCs** which come in #3 and #5. It might also be possible to retrofit Uvex Horizons*** with clear or lightly shaded prescription lenses to get a convenient (but perhaps not terribly attractive) flip-up style.
+(If you decide to buy some, please confirm the glasses are "IR3" or "shade 3" & certified for welding protection first - some vendors' websites are very vague on this.)
+  * http://www.safetyglassesusa.com/s3306.html,
+  * http://www.safetyglassesusa.com/s3307.html
+  * $19 - see http://www.safetyglassesusa.com/brandnames-uvex-xc.html, near bottom. Note also availability of inexpensive IR #3/#5 replacement lenses for Uvex XCs.
+  * http://www.safetyglassesusa.com/s212.html
+//**pgeek**, MarshallProtocol.com//</blockquote>
+{{tag>light}}
 ===== Notes and comments =====

home/lifestyle/light/eye_protection.txt · Last modified: 09.14.2022 by 127.0.0.1