[pct-l] Eyeglass wearers

[Yoshihiro Murakami]

Currently,  the refractive index of the photochromic lens is high (
1.67,   we can get light  glasses), and the reaction is fast now.  It
takes about 1 or 2 minute for the color to dark.  It  become
completely clear.  But,   Driving the car is dangerous , because it
takes about ten minutes for the color to thin.
It is indicated the graph (horizontal axis is seconds,  vertical axis
is street rate of visible light ray) in
http://www.vc.hoya.co.jp/lens/option/color_suntech_neo.html
I cannot found English page.


2010/1/25 Tortoise <Tortoise73 at charter.net>:
> Yes,  these photochromic lenses are available in the US. have been for
> years.
>
> I wear glasses from when I get up to when I go to bed. It seems to me,
> although I may be wrong or just that my information is outdated, that the
> lenses are somewhat slow to change such as when going indoors from bright
> outdoors, or when driving in the daytime and then going into a tunnel. Also
> I'm not sure the lenses become completely clear even in low light.  Maybe
> the technology has improved.
>
> Are there some out there with current experience with these? And how well do
> they combat glare compared to polarized lenses?
>
> Tortoise
>
> Because truth matters"
>
>
> Yoshihiro Murakami wrote:
>
> Isn't there photochromic lens in the United States?  Because I am
> shortsightedness, one glasses are always necessary.  So I always
> wearing the photochromic lens, Such as :
> http://www.vc.hoya.co.jp/lens/option/color_suntech_neo.html (Japansese
> page)
>
> Pros : One glasses OK
> Cons: Looks like yakuza
>
>
>
>
> 2010/1/25 Tortoise <Tortoise73 at charter.net>:
>
>
> I don't know how well these would work, but many optometrists have
> disposable roll-up sunglasses they give to patients after the patients'
> eye dilation.
>
> I use a pair of fit-over sunglasses and they worked well for me.
>  WalMart has them, many optometrists also sell higher priced and maybe
> better sunglasses.
>
> Tortoise
>
> Because truth matters"
>
>
>
> John Vishnefske wrote:
>
>
> I did the colorado trail over snow without sun glasses, and I didn't
> get snowblindness, but things where a tad hazy for 2 days after
> squinting 8 hours on Georgia pass, CO
> ya, I know I'm a newbie to this sort of thing. I can't really
> recommend it. Those rollable things look kinda cool, Tom
> On Sun, Jan 24, 2010 at 10:31 AM,  <jeff.singewald at comcast.net> wrote:
>
>
>
> cut glasses out of black paper?  Come on now.  I would bet you would not be
> able to identify the difference in weight of your pack if you carried two
> sets of glasses (regular and sun).
>
>
>
> Unless you are going to test out this black paper solution in conditions
> similar to what you are going to experience on the PCT, in my opinion it is
> a bad idea.
>
>
>
> elevator
>
>
> ----- Original Message -----
> From: "anna mathys" <haexli333 at gmail.com>
> To: "Eugene" <atetuna at hotmail.com>
> Cc: pct-l at backcountry.net
> Sent: Sunday, January 24, 2010 5:01:13 AM GMT -08:00 US/Canada Pacific
> Subject: Re: [pct-l] Eyeglass wearers
>
> Maybe it's a bad idea, but I was thinking about cut glasses out of black
> paper. Cut horizontal srtipes out to see trough it. Very cheep and light.
> People did so (with leather) as an emergency solution in Himalaya.
> I tried to wear two glasses over each other, but it was unconfortable
> because mainly the front one slides down.
> AnnA
>
> On Thu, Jan 21, 2010 at 9:42 PM, Eugene <atetuna at hotmail.com> wrote:
>
>
>
>
> Got any tips for another semi-blind hiker?
> I'm thinking about getting a set of prescription transition glasses.  I
> don't know if they'll be dark enough, nor how I'll block the sides when
> glare is especially brutal.  I'm also thinking about packing eyeglass wet
> naps to clean my glasses every few days.
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-- 
Sincerely
--------------- --------------------------------------
Hiro    ( Yoshihiro Murakami )
HP:http://psycho01.edu.u-toyama.ac.jp
http://picasaweb.google.co.jp/CompleteWalker/
------------------------------------------------------