Prescription Lenses for Eyeglasses
The basics of choosing lenses
The lenses to choose for your glasses depend
on 3 factors: most importantly, your prescription. Secondly, frame
style of the glasses (i.e. whether it is rimless, full rim or semi-rimless)
and finally the purpose of the glasses.
Some lenses are not suitable for Rimless glasses, for example CR39,
while Trivex 1.53 or high index 1.67 lenses are perfect choices
for Rimless glasses.
If your prescription has high power, high index lenses or ground
lenses have to be used otherwise the lenses would be too thick.
If your prescription has a sphere that is more than -3 diopter,
we do not recommend CR39 stock lenses.
If the wearer is a child or the glasses are to be worn in frequent
sports activity, then it is a good ideal to choose impact resistance
lenses such as Trivex or high index 1.67 lenses.
Lens recommendation program
Have you ever purchased glasses
on the Internet and been frustrated that the lenses fitted to the
glasses was too thick or not suitable for your purpose. We have
the solution for you. To make your online shopping experience as
easy as possible, we have developed lens packages that are suitable
for different prescriptions. Separate lens packages have been developed
for sunglasses as well as single vision, bifocal, and progressive
eyeglasses. The lens recommendation program will give you a maximum
of 3 options that are suitable for your prescription in the order
of basic to advanced features.
You can choose a package according to your budget. The first
package is usually sufficient for your prescription. The lenses
for advanced packages are usually thinner, lighter and have better
cosmetic appearance. They are good options if you have higher
budget.
Within each option, you can add Anti-reflective coating, sunglasses
tints or upgrade to Polarized lenses or photochromic lenses. You
will be presented with recommended lens packages after you enter
your prescription. Please make sure you enter the year when you
were born correctly on the prescription page because age is also
a determining factor on lenses.
With our quality control system in place, you can rest assured that you will
always get the best quality lenses for your prescription at unbeatable
price.
Our competitive lens prices at a glance*
Here are some price comparison between our price
and recommended retail price. Please note not all types of lenses
available from our web site are listed here. As explained in the
first question Basic of Choosing
lenses, the lens to use for your glasses depends on your prescription,
frame style and purpose of the glasses. As a result, the cost of
lenses for the glasses varies. The find out how
much the lenses are going to cost, please follow the instruction
in the next question.
| CR39 |
36 |
82 |
mid
index 1.56 |
39 |
100 |
| Trivex
1.53 |
88 |
146 |
Polycarbonate |
65 |
126 |
| High
index 1.67 |
130 |
260 |
High
index(1.74) |
290 |
530 |
Bi-focal
CR39 flat top 28 |
88 |
178 |
Bi-focal
mid index 1.56 |
115 |
210 |
Progressive
Varilux 1.49 |
135 |
236 |
Progressive
Varilux polycarbonate |
175 |
316 |
How to find out how much the lenses are going
to cost?
The best way to find out the costs of your lenses
is to follow the shopping step, enter your prescription on our web
site. The recommended lens packages will be displayed with all the
available options and prices.
1. Pick a frame with your desired frame style(full-rim, semi-rimless
or rimless).
2. Enter your prescription. Please make sure to enter the year you
were born correctly.
3. You will be presented with a maximum of 3 lens packages. The
first package is usually sufficient. You can change your selections
between packages and adding extra features, such as Anti-reflective
coating, sunglasses tint, polarizer or photochromic, to the lenses
within a package. The total costs are shown at the bottom of the
packages.
What are single vision distance,
single vision reading lenses?
Single Vision Distance
- used to improve vision for viewing objects at distance.
Single Vision Reading, i.e. reading glasses lenses - provide a presbyopic wearer with clear near vision.
Intermediate and distance vision is blurry. This is usually required for people over 40 years old for reading.
What are Bifocal lenses,
Progressive or multifocal lenses?
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Bifocal Lenses having
one segment for near vision and one segment for far vision.
A small portion of the eyeglass lens is reserved for the near-vision
correction. The rest of the lens is usually a distance correction,
but sometimes has no correction at all in it. |
Generally, you look up and through
the distance portion of the lens when focusing on points further
away, and you look down and through the bifocal segment of
the lens when focusing on reading material or detail work
up to about 45 centimetres away.
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Progressive Lenses, also
called multifocal lenses have corrective powers change
progressively throughout the lens. A wearer looks through one
portion of the lens for distance vision, another for intermediate
vision, and a third portion for reading or close work. |
Each area is blended invisibly into
the next, without the lines that traditional bifocals or trifocals
have. Progressives provide a smooth transition from distance
through intermediate to near, with all the in-between corrections
included as well. This constant graduation of the prescription
means that you can look up to see in the distance, look ahead
to view your computer in the intermediate zone, and drop your
gaze downward to read and do fine work comfortably close up.
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Ordering Progressive or Multifocal Lenses on Internet Made
Easy with E Try-on, it totally takes away the guess work.
We have developed a built-in mathematical measurement system
into the E Try-on software.
The data gathered during E Try-on determines the optimal
position of the reading or fitting height of a progressive lens.
Your progressive (Multifocal) lenses can be done just as accurately
as if you were in an optical store on the street.
Please follow these simple steps to order Bifocal or progressive (Multifocal)
lenses.
1. Uploading your photo
to create an account so that you are ready for E
Try-on. You will be brought to the E Try-on screen
to try on the glasses. You may start to try-on glasses now. Or you may
add the glasses to your Try-on list first then come back to E
Try-on as explained in step 2. The available lens options
for the glasses you are trying is displayed when you hover the
mouse over the "RX Lens Options" button. Try as many
pairs of glasses as you like. When you are happy with the glasses
you are trying, click on the "Add to Cart" button. This
will save the data required for fitting progressive lenses to
our system.
2. Only glasses with lens depth that is 27mm or above can be fitted
with Bifocal or progressive lenses. You may want to add the Bifocal
or progressive glasses that you are interested to your try-on
list beforehand. To search for glasses that are available for
Bifocal or progressive (multifocal) lenses, please visit the Advanced
Search page and check the "For Bi-focal or Progressive Only"
option. All the glasses that can be fitted with bifocal or progressive
lenses will be displayed. Check the checkboxes beside the E Try-on
icons under the frames that you are interested. The glasses are
added to your try-on list when you navigate to the next page or
previous page by clicking on the "Next" or "Previous"
Button or the page number at the bottom of the pages. You can
start trying-on the glasses by clicking on the "E Try-on"
button on the page.
When you are happy with the glasses you are trying, please click
on the "Add to Cart" button to save the data required
for fitting progressive lenses to our system.
Please note that you are required to upload your portrait photo
to try-on the glasses for Progressive Lens order. The E Try-on
program collects the data that is necessary for fitting progressive
lenses.
3. In the "Add Prescription Lenses" drop down box,
please select "Progressive No Line". then click on the
"continue" button.
4. Enter your prescription.
5. Select a lens package.
Adjust to the New Progressive Lenses
Please allow one week to adjust to your new
progressive lenses. Even if you have worn glasses with progressive
lenses before, because the new glasses may not have the same design
as your old one, it may take you a while to get use to the new glasses.
The tip is to sit down then put on your new progressive glasses.
Dont walk with the new glasses immediately, only walk around
when you feel comfortable. If you still fell uncomfortable after
10 days, please contact us with
your order number.
Do you sell prescription sunglasses?
Yes. We have more than 30 different styles of prescription
sunglasses for you to choose from. Apart from prescription sunglasses,
all of our eyeglasses can be ordered with sunglass options such
as tints, polarised or photochromic lenses. It costs as little as
$25 extra for sunglasses tints when you purchase your prescription
glasses. To order prescription sunglasses from eyeglasses, simply
choose your sunglasses options
(sunglasses tint, polorised or photochromic) when you choose lenses
for your eyeglasses.
What are polarized sunglasses?
Polarised sunglasses are fitted with polarised
lenses. Polarised lenses provide improved outdoor vision with
better contrast, clarity and because they reduce surface glare,
they're ideal for activities like fishing, boating, driving and
snowing sports. Most of our sunglasses are polarised sunglasses.
You can also turn a eyeglasses with large frame into a polarised
sunglasses by choosing polarised lens options in lens packages.
How to purchase fishing prescription sunglasses?
To improve your vision under strong surface glare
from water, you will need a pair of sunglasses with polarised lenses.
You can choose a pair of sunglasses and add prescription lenses
to it. The original sunglasses lenses will be replaced with the
prescription lenses. Alternatively, you can choose a pair of eyeglasses
and add prescription lenses. When choosing a lens package, remember
to check the polarised lens option.
Why do my lenses need grinding?
You may find that many of our eye glasses lens
packages use ground lenses. All of the lens packages for bifocal/progressive
lenses and prescription sunglasses use ground lenses.
In one word, ground lenses are custom-made lenses. Your lenses are
specially made by a grinding procedure from a blank polymer that
has a certain front curvature. Grinding removes the extra thickness from the lens
to make the lens thinner. Lens grinding takes place after the
lab receives your prescription. Orders with ground lenses usually
take longer, some extra 2-3 days. Ground lenses are usually used
when your prescription has a high power range. Sports eyewear and
prescription sunglasses normally have higher front surface curvature
and larger frame sizes and mostly can only be fitted with ground
lenses.
Please note the following text is for your information only.
You do not have to worry about the difference between different
lens materials in order to choose your lenses. Our Lens recommendation
program will present you with only the lens options that are suitable
for your prescription.
about UV Protection
UV protection ensures your eyes don't suffer any sun-related damage,
sun protection lenses screen out 100% of harmful UV radiation.
You will be pleased to know that all of our lens products come
with UV protection at no extra cost to you. All the lens materials
listed below, apart from CR39, are manufactured with UV-protective
coating. For CR39 lenses, we have added UV-protective coating
at no additional cost to you.
plastic lens - CR39
Most lenses are plastic, the least expensive plastic used for
eyeglass lenses is CR39 lenses. It is suitable for prescription
with lower sphere. Although CR39 is not manufactured with UV-protective
coating and scratch resistant coating, we add these coatings at
no additional cost to you.
mid index plastic lens
These lenses not only provide you crystal clear vision, but also
manufactured with scratch resistant coating. They are lighter,
and thinner ( 37% thinner and 36% lighter than most CR39 plastic
lenses), therefore they are more comfortable to wear than CR39
lenses if your prescription has higher power.
polycarbonate
Polycarbonate lenses are virtually shatterproof and are highly
recommended for children and active adults. Polycarbonate lenses
are lightweight (27% lighter than ordinary plastic lenses), safer,
thinner and flatter. Plus, they have built-in UV protection. It
is suited for rimless frames.
Polycarbonate lenses are not resistant to chemicals such as acetone
or methylated spirit, which is commonly used in optical store
to remove the marking on the lenses. Polycarbonate lenses are
very difficult lenses to tint and are not available for sunglass
tinting.
Trivex 1.53 lens (also known as Trilogy or
Phoenix )
It is a new plastic lens material that is being used as a substitute
for polycarbonate lenses. It is optically superior to polycarbonate
in that it has less distortion than polycarbonate and it is lighter.
Trivex 1.53 is resistant to chemicals such as acetone or methylated
spirit. Like polycarbonate it provides 100% UV protection and
it is extremely durable (ten times more impact resistant than
ordinary CR39 lenses). Most importantly, it is a great substitute
for polycarbonate lenses that need to be tinted, because it can
be easily tinted but polycarbonate cannot.
high index Aspheric design
Aspheric design allows you to obtain a thinner, flatter and lighter
lens than standard lenses. Aspheric lenses give you the closest
thing to natural vision. It reduces lens thickness and improves
the aesthetic appearance of the lens by reducing magnification
of the eyes which makes your eyes appear more natural.
These lenses provide you with 100% UV protection, scratch resistant
coating and anti-reflective coating. They are most suitable for
very high-powered prescription.
1.74 super high index lens
This is the most upper market plastic lens. Suitable for very
high minus prescription. They are manufactured with UV-protective
coating, anti-reflective coating and scratch resistant coating.
However, these lenses are not tintable and not available with
polarizer.
Anti-reflective coating
Anti-reflective coating reduces the reflection on your glasses.
This means people can see your eyes, not your lenses. You'll also
see more clearly when driving at night, using a computer or during
other harsh lighting conditions.
Scratch Resistant Coated Lenses
We provide scratch resistant coating on all lenses that we sell
at no additional charge. We highly recommend a scratch-resistant
coating on any lens you purchase in any occasion. Before you purchase
lenses, check to see if scratch-resistant coating is included, or
if it requires an additional fee.
Sunglasses options
All of our prescription glasses can be ordered with sunglass options
such as tints, polarised or photochromic lenses. It costs as little
as $25 extra for sunglasses tints when you purchase your prescription
glasses. To order discount prescription sunglasses, simply choose
your sunglasses options (sunglasses tint, polarised or photochromic)
when you choose lenses for your eyeglasses.
Sunglasses tint
A sunglasses tint is simply a coloured tint that gives you great
prescription sunglasses. Our tinting options offer you either grey
or brown tint. All of our prescription lenses comes with UV protective
coating for free for your maximum protection from harmful UV radiation.
Polarised lens
They provide improved outdoor vision with better contrast, clarity
and depth along with more vibrant colours perception. And because
they reduce surface glare, they're ideal for activities like fishing,
boating, driving and snowing sports. They also make great driving
sunglasses, especially at dusk.
Photochromic light sensitive lens
Photochromic Lenses contain light-sensitive molecules that darken
and lighten according to the intensity of ultraviolet light. It
clears indoors, darkens outdoors, providing visual comfort without
the need to change glasses. We use Sunsensors for 1.56 index
photochromic lenses, Transitions® lenses +
for every other index photochromic lenses.
Photochromic lenses are available with most of plastic material
mentioned above except 1.74 super high index lenses.
*Prices are subject to change without notice
+Transitions is a registered trademark of
Transitions Optical, Inc. |
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