reactolite lenses don't go dark?

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niz - 15 Nov 2006 20:02 GMT

i just bought a pair of prescription specs with reactolite lenses - but
after 8 hours of use i haven't noticed them go dark! this included
walking around outside in a cloudy uk november day for several hours,
and staring up at my kitchen fluorescent lamp for a few minutes.
neither of them had any noticeable darkening affect!

how can i test if they are working and be sure they're ok once and for
all? obviously its a bit difficult finding bright sunshine in the uk in
november.

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odtobe - 16 Nov 2006 01:29 GMT

Sounds like you might not have enough light to actually activate them.
The US counterpart to Reactolite lenses are Transitions and they are
generally activated by UV light. UV is somewhat limited by cloud cover,
and this might be your problem. Also Transitions have the problem of
not working well if the temperature is cool, or cold. They darken
slowly or not to thier full tint. Keep in mind too that gradual changes
in darkness are compensated by your eye as well. Meaning that when you
wear the lenses you might not actually notice that they are in fact
getting darker. To test that the material is working correctly find a
UV source, tanning bed or something similar and see if they activate.
Hope that this help.

ODTOBE

> i just bought a pair of prescription specs with reactolite lenses - but
> after 8 hours of use i haven't noticed them go dark! this included
[quoted text clipped - 8 lines]
> --
> email in header invalid - please reply to group

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Tomasso - 16 Nov 2006 02:06 GMT

> Sounds like you might not have enough light to actually activate them.
> The US counterpart to Reactolite lenses are Transitions and they are
> generally activated by UV light. UV is somewhat limited by cloud cover,
> and this might be your problem. Also Transitions have the problem of
> not working well if the temperature is cool, or cold.

The opposite is true. Cold = more responsive. Hot = less.

> They darken
> slowly or not to thier full tint. Keep in mind too that gradual changes
[quoted text clipped - 18 lines]
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odtobe - 18 Nov 2006 18:15 GMT

That's right. Thanks for corresting my post.

> > Sounds like you might not have enough light to actually activate them.
> > The US counterpart to Reactolite lenses are Transitions and they are
[quoted text clipped - 26 lines]
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> >> email in header invalid - please reply to group

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arehset@gmail.com - 16 Nov 2006 14:40 GMT

> Sounds like you might not have enough light to actually activate them.
> The US counterpart to Reactolite lenses are Transitions and they are
[quoted text clipped - 22 lines]
> > --
> > email in header invalid - please reply to group- Hide quoted text -- Show quoted text -

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Robert Martellaro - 16 Nov 2006 16:52 GMT

>i just bought a pair of prescription specs with reactolite lenses - but
>after 8 hours of use i haven't noticed them go dark! this included
[quoted text clipped - 5 lines]
>all? obviously its a bit difficult finding bright sunshine in the uk in
>november.

Mask one lens and set outside for five minutes. The masked lens should look
lighter. If not, they are not photochromic/reactolite (glass?).

Hope this helps,

Robert Martellaro
~~~~~~~~~~~~~~~~~~
Optician/Owner
Roberts Optical
Wauwatosa Wi.
~~~~~~~~~~~~~~~~~~
"An expert is a person who has made all the mistakes that can be made in a very narrow field."
- Niels Bohr

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