Hi All,

Pls do remember that the thinner the plastic lenses the more likelyhood they
become warpage especially fit on full rim frames, and crazing on the lens
surfaces often in less than a year.

On Sat, 19 Jan 2008 11:55:42 -0800 (PST), holytruthbc[at]gmail.com wrote:

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The optician should be professional and knowledgeable. Most states do not
regulate or license opticians. Caveat emptor.

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Ask the doctor to justify the "need" for 1.60 index lens.

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That's generally not the doctor's domain.

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I don't accept insurance, but I'm pretty sure that if you use Davis, the glasses
will be fabricated by labs that Davis owns.

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When set up properly, both cars can be fun and satisfying to drive.
Under-inflate the tires, misalign the suspension, aim the headlights wrong,
etc., and both will drive like a Yugo.

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Primarily thickness and cost (1.67 is more expensive). Davis probably uses just
three materials: cr39, poly, and 1.67.

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Probably not. There may be better lenses for you than the 1.60 index of
refraction material.

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Not a clue.

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Bingo!

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It's not the brand, it's the fit and finish, knowing how to position the lens,
doing it accurately, and pointing the client in the best direction that serves
their needs and interests.

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Insufficient data. However, Trivex should be on the table.

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If you can't find a good optician in the Davis network, then go outside of
network, and explain the situation to the optician- some will modify their fee,
maybe an introductory fee to welcome new clients. Then drop the eyeglass
coverage from Davis.

Robert Martellaro
~~~~~~~~~~~~~~~~~~
Optician/Owner
Roberts Optical
Wauwatosa Wi.
~~~~~~~~~~~~~~~~~~
"Science is a way of trying not to fool yourself."
- Richard Feynman

<holytruthbc[at]gmail.com> wrote in message
news:ecb39c69-897e-416f-88d5-769f54704c4d[at]e10g2000prf.googlegroups.com...
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No, that is not true. 1.60 and 1.67 are both commonly dispensed lens
indexes, and I am sure your doctor knows the difference. Typically, higher
index lens materials are used with a stronger power lens to make it thinner
(and therefore lighter). The higher the index, the more chromatic
aberration, although not every one would notice it. For your moderate lens
power, a 1.67 index lens is not necessary to get a reasonably thin lens and
it makes perfect sense that your doctor would recommend a 1.60 index lens
material for your Rx.

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For single vision lenses of moderate power (like yours), a spherical lens is
probably what will be dispensed. There is not much of a difference between
one lens manufacturer and another assuming the same material (index) is
used. The choice of AR is more important, primarily because a cheap AR
coating is easily damaged (ruining the lens) and harder to clean than a high
quality coating like Crizal Alize (and some others).

Lens designs, and hence the lens manufacturer, becomes more of an issue when
you get into aspherical or atoric single vision lenses, or with progressive
lenses.

On Jan 19, 8:13 pm, "Mike Tyner" <mty...[at]mindspring.com> wrote:
- quote -

Spoke To Davis Vision again. They do offer Crizal Alize for a fee of
$48.00 and high index of 1.67 for an additional $55.00. The optician
was going to charge me $275.00 for the lenses plus at least that much
more for the frames.
The person I spoke to at Davis said that my doctor meant 1.67 when he
said 1.6 Could this be true?
Also, which manufacturers of lenses are best? Which ones would suit me
best? My right eye is pretty bad and has some scarring (advanced
keratoconus) The doctor was able to find a pretty good fit for me
during the exam for my left eye, But not for my right eye primarily
due to the scarring.
Also, his assistant tried to fit my eye for the new IZON high
definition lens but couldn't do it due to from what I understand high
abberrations in the eye. She couldn't get the red dot to the center.

Thank you

"Mark A" <nobody[at]nowhere.com> wrote

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Nobody makes money on Davis except Davis.

Many ODs do OK without selling glasses. I'd much rather someone else handle
selling and fitting and dispensing and adjustments.

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I'd be surprised if Davis covers Alize, or allows such a choice of products.
Don't they limit you to Davis frames, the same "tower" in each office?

-MT

On Sat, 19 Jan 2008 17:32:13 -0500, "Mark A" <nobody[at]nowhere.comwrote:

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Not all ODs. I certainly make money on my exams.

<holytruthbc[at]gmail.com> wrote in message
news:8eda744f-431e-46f4-b780-7766769260e0[at]l1g2000hsa.googlegroups.com...
- quote -

OD's don't make any money on exams theses days, and if you leave the office
without buying your lenses there, then it is normal for them to be upset
(and to tell you the world will come to end if you elsewhere for your
lenses). They are required to let you leave with the Rx in hand because of
the FTC (Federal Trade Commission), not by their own choice.

It is not normal for a an OD to specify a lens material on the Rx. They may
have a strong recommendation (just like an optician in an optical store
might have strong opinions), but it simply is not normal practice to specify
an exact lens index on an Rx.

Lenses are made in various materials and may have coatings on them. I am not
sure why your subject says "High Index Glass" because it is very unusual for
people to use glass lenses these days because of extra weight that they
have, and because of safety reasons in some cases. Therefore let's discuss
plastic lens materials that might be appropriate for you.

Plastic lenses come in various indexes, which sometimes have significantly
different properties. For example:

1.50 index (known as Regular Plastic or CR-39)
1.53 Trivex (sold as Hoya Phoenix and other brands) - about as strong as
polycarb but better optics
1.59 Polycarbonate - These are sold as safety lenses but have poor optical
qualities (chromatic aberration)
1.60 plastic
1.67 plastic
and some others.

Not all 1.67 lens materials are identical because they are made by different
manufacturers (same with other indexes). The higher the index, the thinner
the lens (and therefore lighter the lens) and the worst the optical quality
(higher the chromatic aberration). One exception is polycarb, which has the
worst optical qualities of any commonly dispensed lens even though it is not
the highest index or the thinnest.

So, if your Rx is moderate, you may not need a higher index (1.67) lens to
keep the lens thin, because of your moderate lens power. 1.67 is fine, but
not quite as good optically as 1.60 (but not everyone can tell the
difference). 1.60 material is a good choice for your lens power that
balances weight and optical quality.

Crizal Alize is a lens coating that is AR (anti-reflective) to reduce glare
and reflections. It is one of the better AR coats on the market and is
fairly durable. The cheap AR coatings will scratch very easily and/or be
difficult to clean. Crizal Alize is Crizal Alize no matter where you get it.
But Cirzal is different than Crizal Alize, the later being easier to clean.

If your optician cannot supply 1.60 with Crizal Alize (or other high quality
coating such as Zeiss Carat Advantage) then call around elsewhere. But 1.67
will not necessarily be a bad choice, and you may not notice the slightly
reduced optical quality, and your glasses will be thinner and lighter.

Avoid polycarb like the plague. If you need safety glasses, get Trivex.

Hello,
I am new to glasses and need some help. I have Keratoconus. I
tried contact lenses and just couldn't handle them. They did provide
excellent vision.
Recently went to an optometrist and got a prescription for glasses.
After the exam his assistant tried to fit me with a frame but it
wasn't comfortable, so I said that I would need to see some other
frames in another shop. I was very nice to them. But she go upset and
showed her attitude.
Just before she started showing me the frames the doctor told me that
I would need to get a Crizal Alize with Clear Guard lens with a 1.6
index.
Now after I told her that I would have to see some more frames before
I make my choice she went to the doctor's office and got a
prescription from him. This is what the prescription says:
Spherical I Cylindrical I Axis
IO.D.I -1.00 -3.00 30
D.V.
I O.S I -.50 -1.5 180 (with a zero inside
the 0)

Why doesn't the prescription say Index 1.6 as the doctor specifically
said before she tried to fit me with a frame?
Also, it says nothing about Crizal Alize with Clear Guard.

As I was leaving with my wife the assistant said that If get this
prescription filled at another place it will probably not be done
right since even if they say they use Crizal it will probably be done
at a different lab and I would then end up coming to them and having
it done right. She then said there is a difference between a Mercedes
and a Volkswagen. I tried to take it in stride but didn't really like
these kind of selling tactics. After all I came to see the doctor and
I did. I never came there to buy something.

I called Davis Vision (my vision plan) and was told that they do
indeed use Crizal Alize with clear Guard. I then asked about the 1.6
index and she said that they use 1.67 What is the difference? and if
any is it better for me to get the 1.67 vs. 1.6 that the doctor
specifically said.

Also are these lenses going to be done at a Crizal Lab or is Davis
going to get their lenses from another manufacturer and then send them
to Crizal to apply the coating?

How do I know which manufacturer Davis will use to get the lenses?
They are not sure themselves.
Which manufacturers and brands are better or even best?
Also is it better to get the lenses in glass or plastic or
polycarbonate?

I will greatly appreciate any light anyone can shed on this..