Lens are distinguished by manufacturer, model/design, and material.
Manufacturers have multiple models/designs, and each of these typically
comes in multiple materials (although some opticians will only dispense only
one or a two of the several materials that the lens is available in). You
didn't mention the Model of the Nikon, but that may or may not be relevant
here (hard to say).

In the US, the Nikon brand name is owned by Essilor, which also sells lenses
under the Essilor and Varilux brand names in addition to Nikon (Essilor does
not own the Nikon brand name outside of the US). For example, the NikonEyes
Customized Progressive sold at Walmart is really a Essilor Accolade Freedom
(which is similar to the Varilux Physio 360).

Chromatic aberration is a concern with polycarb, especially with high power
Rx's. Generally speaking the higher the index, the thinner (and therefore
lighter) the lens, but the more chromatic aberration. The one glaring
exception to this is polycarb, which has the lowest abbe value (highest
chromatic aberration) of any commonly dispensed lens material (even though
its indexes is about 1.585)

Polycarb has very high tensile strength and impact resistance. It is favored
by opticians for 3 reasons:

- it avoids potential lawsuits regarding safety lenses and "duty to warn"
especially for children or people who will wear the lenses during sports or
in a workshop, etc.

- it is often more profitable than other materials

- if your frames are drill mounted or rimless (or semi-rimless) there is
less likelihood of breakage when mounting the polycarb lens to a frame (for
a rimless frame a groove has to be cut in the lens for the underwire).

Personally, I would never wear polycarb and would adjust my frame choice if
necessary. However, there are opticians who will make a rimless frame in
something other than polycarb (they just don't like to as general rule).

When deciding between 1.60 and 1.67 your main issue is going to be weight,
edge thickness, and optical quality. The edge thickness is an aesthetic
consideration. The weight of the lens "could" affect your vision (in theory)
if your glasses are so heavy that the slip down from your nose. But a 1.60
lens definitely has better optics than a 1.67.

How to Make Money using PayPal? How to make extra PayPal as seen
on Oprah? EARN EXTRA MONEY IN PAYPAL money in AS SEEN ON OPRAH AND
20/20

Dear Friend, You probably have seen these, but they really do work,
give
it a try -- think of how you waste $6 in a day, week or month. It's a
minor investment with great rewards. This might really help you pay
off
those credit cards and give you the ability to move out. If you could
start your own mail order list with an investment of $6.00, and make
$800,000 over the next year would you do it? ***Proven by various,
highly-respected U.S. TV and Radio programs as being 100% legal,
feasible
and true. Oprah Winfrey and ABC's investigation team 20/20 also prove
it
can be done.***

IF A 15 YEAR OLD BOY COULD MAKE $71,000 IN JUST 5 WEEKS AND OTHERS
$250,000 IN A FEW MORE WEEKS -- SO CAN YOU!!! Would you like to make
$71,000 OR $250,000 in a few weeks? As seen on the Oprah Winfrey show
and
ABC's 20/20

The true story that has everyone talking: Parents of a 15yr old boy
find
$71,000 in his closet: You may have seen this story featured on a
number
of major news programs (United States), and reported elsewhere around
the
world. His mother was doing some cleaning and putting some laundry
away
when she discovered a large brown paper bag that was suspiciously
buried
beneath some clothes and a skateboard in the back of her 15-year-old
sons closet. Nothing could have prepared her for the shock she got
when
she opened the bag and found that it was full of dollar bills --
$71,000
to
be precise!! "My first thought was that he had robbed a bank", says
the
41-year-old woman, "There was over $71,000 in that bag, that's more
than
my husband earns in a year". The woman immediately called her husband
at
the car-dealership where he worked to tell him what she had
discovered.
He
came home right away and together they drove to the boys school and
picked him up. Little did they suspect that where the bills were
coming
from was going to be a bigger surprise than actually finding them in
the
closet? As it turns out, the boy had been sending out, via E-mail, a
type
of "Report" to other E-mail addresses that he obtained off the
Internet.
Every day after school for the past 2 months, he had been doing this
on
his computer in his bedroom. "I just got an E-mail one day and I
figured
what the heck, I put my name on it like the instructions said and I
started sending it out", says the 15-year-old. The E-mail letter he
received had 5 names and addresses listed on it and contained
instructions
on how to send one $5 dollar bill to each person on the list. Then
delete
the name and address at the bottom of the list (Report # 5) and move
the
other 4 names and addresses down one step, finally add

It's true. The boy legitimately earned $71,000.
You should print this, read it and read it again and again if
necessary.
Then follow the simple instructions. You too could make $71,000 and
much
much more.

Here are the 4 easy steps to success:

STEP 1:

Take a few minutes to join PayPal: Remember to verify your account.

www.paypal.com

The Internet's most trusted Internet banking system for your future
income.

When creating your PayPal account make email address you used for
PayPal on the list below so people
can send money to your account.

STEP 2:

Once you have a PayPal account running, use PayPal to post $1 to
EACH of the 6 Email Addresses below
because you pay people with an email address in PayPal. Select "SEND
MONEY".

To do this you may need to use a credit or debit card, which is very
easy, and secure so nobody but
PayPal may see it.

What you are doing is creating a service. This is absolutely legal!
You are requesting a legitimate service
and you are paying for it!

Here are the 6 individual Email addresses that you have to send $1
to through PayPal for this to work
properly and for you to receive money.

(If you don't send the money and decide to post the message with your
name
in it anyway, PayPal will instantly pick this up and terminate your
account, immediately, besides the other penalties!!) If you did this
you
could get into serious trouble because it is fraud. (So follow the
instructions and post the $6 and you will make lots of money with no
hassles.)

Now Send $1.00 to each of the six people on the list using PayPal, and
in the comment (Subject) section type "Please add me to your list".
Below are the emails that you transfer the money into:

These groups of email addresses are PayPal IDs or usernames.
Choose what group of email addresses you what to Send 1 Dollar :

1. bigmillzz@zoomtown.com
2. aimee011497@yahoo.com
3. codey6002@yahoo.com
4. tinkerbell85121@aol.com

5. wiebusch05@aol.com
6. tarkneeka_bivens@yahoo.com

STEP 3:

Now after sending $1.00 to each of the email placements above, take
the #1 Email Address off the list,
move the other Email Addresses up (6 becomes 5, 5 becomes 4, etc.)
and add Your Email Address as
number 6 on the list.

STEP 4:
Change anything you need to, but try to keep this article as close
to the original as possible.

Now, post your amended article to at least 200 news groups (there

are thousands of groups).

And email your message to as many people you can. Remember, the more
you post and email the more money you make! This is perfectly legal!

You are getting paid for a service, the sender of the money asks you
to
Please add me to your list, Therefore it is legal. Remember to send
a dollar to the above names or this is considered illegal.

HOW TO POST TO NEWS GROUPS:

Use the internet and searching for various news groups, ad posting
websites, on-line forums, message
boards, chat sites, discussions.

Log on any search engine like yahoo.com, google.com, altavista.com,
excite.com, etc., then search with the subject "money making message
board" or "classified ads"
You will find thousands and thousands of message boards and
companies like Adblaster.com, InetGiant.
com, LiveDeal.com, Adsubmitter.com etc=85

Click on them one by one and you will find the option ''post a new
message''. Then Post this article
as a ''new message'' by highlighting the text of this letter and
selecting copy then paste from the edit
menu.

Fill in the Subject, this will be the header that everyone sees as
they scroll through the list of
postings in a particular group, click the post message button.

You can also read other peoples ads for business opportunities and
respond to their email
address with this business opportunity.

You're done with your first one! It only takes about 60 seconds to
complete postings on message boards
after you catch on.

REMEMBER, THE MORE NEWS GROUPS YOU POST IN, THE MORE MONEY YOU WILL
MAKE!!

But you have to post a minimum of 200!

How does it work?

Step10

When you post 200 letters, it is estimated that at least 15 people
will respond and send you $1 ($15).
Those 15 will post 200 letters each and 225 will send $1 ($225).
Those 225 will post 200 letters each and
3,375 people will send you $1 ($3,375). Those 3,375 people will post
200 letters each and 50,625 people
will send you $1 (50,625). Those 50,625 will post 200 letters each
and 749,375 people will send you $1
(749,375). At this point your name drops off the list, but so far,
you have received $813,615.00.

With an investment of only $6.00!!

A - M - A - Z - I - N - G - !!

When your name is no longer on the list, you just take the latest
posting in the news groups, and send out
another $6.00 to Email Addresses using PayPal on the list, putting
your name at number 6 again.