Re: Deteriorating night vision

In article <6qr1duFe99p8U2@xxxxxxxxxxxxxxxxxx>,
me@xxxxxxxxxxx says...
Nicky wrote:
On Mon, 15 Dec 2008 21:27:50 -0500, "Evelyn" <evelyn.ruut@xxxxxxxxx>
wrote:

No, that is the old stuff, which was a coating applied to the glasses after
they are made. The Crizal has the no glare BUILT IN to the actual product
itself, plus it is super hard, much harder than ordinary lenses. Look into
it. It is not a coating. I used to always get the coatings too, and the
glasses got so dirty so quickly, and they scratched easier. Not the
Crizal. It is amazing stuff.

Sure sounds interesting, I'm fed up with the coatings - the anti-glare
stuff plus the anti-scratch. Does the new stuff come in super-thin, I
wonder?

Nicky
T2 dx 05/04 + underactive thyroid
D&E, 100ug thyroxine
Last A1c 5.4% BMI 25

polycarbonate, Nicky

it's thinner than regular material
it's very strong (recommended for kids here, especially if they are into
sports)
somewhat scratch resistant (the eyeglass place says you don't need the
scratch coat)
and i HATE all of the anti-glare lenses i have had, due to the colour
that it gives to the lenses, not to mention the finger print problem

the Crizal mentions that finger prints can be a problem with it


Kate: What is your your prescription adjustment for
myopia? -3.0,-4.0, greater? I hung out a lot in
sci.med.vision. After you wade past their equivalent of
Chung and the aspartame nutters, they have several
opticians and optometrists who help out. Polycarb is
used a lot because it is cheap. At an index of 1.59, it
also has about the worst light distortion (expressed as
an abbe value) of all lenses materials. In a moderate
myopic prescription, it would probably would not be
noticed. For a more shatterproof version of a
polycarbonate, in North America you could ask for a
brand called Trivex.

Hi-Index plastics (1.60,1.64,1.65,1.66,1.67,1.70) are
thinner at higher myopic prescriptions like mine (-6.75,
-7.25 in each eye respectively). They also have a much
better abbe value than polycarb, therefore less
distortion. Hi-Index are preferred for progressives for
above moderate prescriptions as well.

The new modern anti-reflective coatings are worlds apart
from the old "applied" coatings. They are very durable,
easier to clean, have little distortion, and built into
the lenses before they are ground. Crizal was the first
big brand name, but there are other brands. Teflon just
got into the act as well. All of these coatings can be
ordered with any of the better brand names lenses.

Two interesting threads in sci.med.vision are:

http://tinyurl.com/55lq5y

http://tinyurl.com/65ukgz

Dennis (Type 2)
.

Relevant Pages

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