According to the old Zenni site, they stated that photochromics have the
benefit of always being there, and responding directly to the levels of UV
light. The negatives were that they don't get as dark as the 80% (closer to
60% if memory serves), and that they require UV light to work.
Why is this important? Because all car windshields have UV blockers in
them, so they won't darken as much as you might like or expect.
-- Chuck Knight
On Fri, May 14, 2010 at 9:25 AM, powrwrap <[email protected]> wrote:
>
>
> > On May 13, 1:10 pm, David Keel <[email protected]> wrote:
> > I know you asked about Zenni specifically, but your questions about
> photochromic lenses probably apply to many vendors.
> >
>
> > It's nice to have them if I forget to bring my clip-on.
>
> > You have to look directly at the sun to get them to darken. When driving,
> they are little help at all and will not help with glare.
>
> > They darken rather quickly. They take much longer to turn clear again.
>
> > Over all, I am sort of ambivalent about them. I thought I could dispense
> with a clip-on but that turned out to not be the case. I would never pay a
> lot for photochromic. To me they are a back-up for the clip-on. If I am
> going out to lunch, I will often just use the photochromic lenses and not
> bother with my clip-on.
> >
> > They are not (IMO) as cool as they look on TV.
> >
> > Dave
>
> Thanks for the input. I was hoping to ditch my set of tinted
> eyeglasses as I'm getting tired of switching glasses every time I go
> outside, but it doesn't sound promising according to your report,
> especially the part about glare while driving.
>
> --
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