
When buying
eyeglasses,
most people are unaware of the lenses that are available to them. With
evolving technology, lenses have become much more advanced and just as
important as eyeglass frames.
We've created this simple guide to educate and help you better
understand the types of lenses and wide assortment of lens options that
are available. While reading this guide, you should ask yourself some
questions like:
- Do I spend a lot of time outdoors?
- Do I play impact sports?
- Do I spend a lot of time driving in a car, particularly at night?
- Do my eyes become easily irritated by the sun?
- Do I spend a lot of time in front of a computer?
- Do I wear eyeglasses more than 2-3 hours per day?
The answers to these questions will help you determine what lenses will work best for you and your lifestyle.
Types of Lenses
After
an eye exam, your provider will know your prescription and be able to
recommend the type of lenses that you need. Most people require single
vision lenses to correct nearsightedness or farsightedness or a
multi-focal lens (i.e. bifocal, trifocal and progressive lenses) when
there is more than one vision problem to correct. In rare cases, some
people require lenticular lenses to treat serious eye conditions such as
cataracts.
Lens Materials
Once you know what type of lenses you need, you and
your eye care
professional will need to decide what type of materials your lenses
should be made of. It is best to have a list of questions to ask your
doctor to ensure that your lenses are as functional as they are
fashionable.
High-Index Lenses: These lenses are
manufactured using a specialized plastic that refracts light better than
normal plastic lenses. High-index lenses are thinner, lighter and more
comfortable than traditional plastic lenses.
Polycarbonate Lenses:
These lenses are made of a hardened plastic that are more impact-
resistant than standard plastic lenses and have ultra-violet (UV)
protection manufactured directly in the lenses.
Photochromic Lenses:
Photochromic lenses will change from clear lenses into dark-colored
lenses, similar in color to that of sunglasses, when exposed to the
ultra-violet (UV) rays found in sunlight.
Polarized Lenses: .
Polarized lenses, which are often used in sunglasses,
will eliminate glare that is caused when direct light is reflected from
a horizontal surface like snow, ice, sand or water. By eliminating
glare, UVA and UVB these lenses are also extremely helpful to people
that have decreased vision from eye conditions such as cataracts and
age-related macular degeneration (AMD).
Lens Coatings
There
are a multitude of coatings available for lenses today. All of the
coatings listed below can be added to lenses during the manufacturing of
your eyeglasses. The type of coating(s) you and your provider may
select will depend on your lifestyle and what is most beneficial to you.
Scratch-Resistant Coating: This type of coating is highly beneficial because it protects and extends the life of your lenses.
Anti-Reflective (AR) Coating:
This type of coating reduces the amount of reflection on the lenses,
which increases the amount of light that is able to pass through the
lens.
Ultra-Violet (UV) Coating: It is extremely
important to protect yourself from the long-term damages of UV rays from
sunlight. UV coating will help block these harmful rays as light
passes through your lenses.
Read the original article on
davisvision.com
Purchasing eyeglasses should be looked upon
as an investment, so think about your lifestyle needs carefully when
picking out lenses because you can achieve both functionality and
fashion success with the right type of lenses and available coatings.
If
you’re experiencing changes in your vision or visible changes to your
eyes, these can be early warning signs of serious eye conditions. No
matter how busy you are, you must put aside some time for yourself to
get your eyes looked at by a certified optometrist. Check out our previous post on the
importance of eye exams
for more information. If you’re worried about what happens during an
eye exam, check out this video from About.com which shows
what happens during an eye exam.