Talk:Photochromic lens

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Action[edit]

The mechanics of this is not explained at all. All there is is an ingredient list and some handwaving about UV light and thermal effects. 65.93.13.210 (talk) 06:32, 20 January 2011 (UTC) Do all photochromic lenses prevent sun-damage for eyes? It would be helpful if this article could advise whether all photochromic spectacles filter UVA as well as UVB. The website http://www.allaboutvision.com/lenses/photochromic.htm says photochromic lenses filter 100% of UVB and UVA, but I do not know its reliability. According to skin-care websites there are two relevant classes of UV light. UVB light is more energetic and causes sunburn as well as skin damage including cancers, UVA light causes skincancers but not usually sunburn. UVB is blocked by all glass, UVA light is not blocked by ordinary glass. There is also Transition lenses a brand-name that may or may not be identical to all photochromic lenses.AuntFred (talk) 03:12, 13 January 2018 (UTC)[reply]

Link[edit]

The #2 reference link is broken. Somewhat Agree (talk) 16:41, 9 August 2011 (UTC)[reply]

Inventor[edit]

The person who invented this has been changed several times. — Preceding unsigned comment added by 130.160.186.78 (talk) 13:56, 23 April 2012 (UTC)[reply]

Advantage for Skiers or Not?[edit]

The article first claims Transition lenses provide an advantage to skiers, then claims it does not. 174.112.10.156 (talk) 08:05, 24 July 2012 (UTC)[reply]

potential for nighttime vision to be seriously diminished with photochromic lenses[edit]

I think there's little doubt about the following statement from the article (as it would seem accurate) although it could use a citation if there's an online source:

"A study by the Institute of Ophthalmology at the University College London has suggested that even in dark conditions photochromic lenses can absorb up to 20% of ambient light."

This document certainly adds support: http://www.maib.gov.uk/cms_resources.cfm?file=/Ouzo_Annexes.pdf

which I found referenced in this discussion: http://www.optiboard.com/forums/showthread.php/48338-Photochromic-lenses-should-not-be-worn-for-lookout-duties-at-night

The reason why I'm here is I suspect that photochromic lenses, even the modern ones I'm wearing today, can severely affect vision for the worse at nighttime (if I'm right about the cause - although I can see very good at night (last night in fact) in other pairs of photochromic lenses).

I think this article should *not* be merged with the more general article as suggested. It has importance on its own. — Preceding unsigned comment added by Gyoung572345790234789 (talk • contribs) 23:55, 18 September 2012 (UTC)[reply]

'Transitions' lenses[edit]

The Transitions web site claims that they have a lens that will react to visible light. There is no explanation of this. This is important because regular photochromic lenses only react to high energy UV light; 'Transitions' claim that their driving glasses work even when the UV light is removed by a car windscreen. — Preceding unsigned comment added by Clichoid (talk • contribs) 15:23, 27 April 2013 (UTC)[reply]

Photosensitive glass[edit]

The reader of this article sees no mention of photosensitive glass. Equally, the reader of Photosensitive glass would be unaware of photochromic glass or other smart glass technologies such as electrochromic glass. That should be corrected by providing links to these articles. Plantsurfer 10:37, 28 October 2015 (UTC)[reply]

External Reference changed[edit]

The link in external references gets redirected to some page about cellphones. I think the correct link on that website is now https://science.howstuffworks.com/innovation/everyday-innovations/sunglass7.htm I dont feel comfortable changing a link on main article. 222.152.250.9 (talk) 23:00, 15 March 2023 (UTC)[reply]

Sentence needs work[edit]

"They are typically used for outdoor sunglasses rather than as general-purpose lenses."

Maybe "outdoor SPORTS"? Seems odd as it is considering that all sunglasses are outdoor sunglasses? 95.89.81.118 (talk) 15:46, 30 April 2023 (UTC)[reply]

UVA/UVB Transmission and "Failed verification" note[edit]

I saw the note that citation 5 ("What Is Ultraviolet (UV) Radiation?" from cancer.org) doesn't verify the UVA/UVB blocking of regular glass and confirmed that that's so (at least for the web page as it currently exists; maybe once upon a time it did describe different materials' UVA/UVB blocking potential, but not now).

The article on Ultraviolet talks about different materials' ability to block or transmit UV and cites an archived webpage showing some transmission curves for a few different types of glass (https://web.archive.org/web/20120327213950/http://www.sinclairmfg.com/datasheets/optical3.html). I don't have the knowledge base to confidently interpret the source (some of the charts have breaks in the middle with differences in scale and i'm not sure what to extract from them), but would that be a better source for claims regarding UVA/UVB blocking than the current cancer.org citation? TheGirlWarlockEditor (talk) 18:51, 23 January 2024 (UTC)[reply]