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Contact
Lenses & Fitting Exam |
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Contact
Lens
Contact lenses are delicately crafted, very thin,
clear optical discs of plastic that float on the
tear film that coats the cornea. The health of
the corneal surface and tear film are very important
to your comfort and the clarity of your vision
when you are wearing contacts.
Contacts are
popular because they do not change cosmetic appearance
and provide better peripheral vision than glasses.
In addition, contacts can reduce or eliminate
the image distortion sometimes caused by eyeglasses.
They also allow more freedom during recreational
and sporting activities. Depending on your lifestyle,
your motivation, and health of your eyes, contact
lenses may provide a safe and effective alternative
to eye glasses when used with proper care and
maintenance.
Contact
lenses are used to correct the same refractive
errors that eye glasses correct. For example,
myopia
(near-sightedness), hyperopia
(far-sightedness), astigmatism
and some bifocal prescription can be corrected
with contacts. NeoVision has many different types
of contact lenses to choose from.
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Different
Types of Contact Lenses: |
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Many
different plastics are used in the manufacture
of contact lenses, but there are two general types
of lenses: hard and soft. First Hard lenses
were PMMA contacts that were developed in the
1960’s but are rarely used today. They are
replaced by rigid gas permeable (RGP) contacts,
which are similar to PMMA lenses in design and
appearance but are made of a material that is
permeable to gases such as oxygen and carbon dioxide.
PMMA contacts were completely impermeable to gases.
RGP lenses
may be the best choice when the cornea has high
astigmatism (i.e. cylindrical power). These are
also the best choice for conditions such as keratoconus,
where the cornea is excessively conical in its
curvature. They may also be preferable when a
person has allergies
or tends to form protein deposits on his or her
contacts. RGP lenses last longer, are less likely
to breed bacteria, disinfect more easily, do not
dehydrate, and provide crisper vision than soft
contacts. However, they usually cost more and
take longer to adjust to than soft lenses.
Soft lenses are made from a water
absorbing material called HEMA (Hydroxy
Ethyl Metha Acrylate). This water allows
the eye to "breathe" through the
contact lens. The water also gives them
their flexibility. If you let a soft lens
dry out, it becomes quite brittle. Soft
lenses are very delicate to handle and are
the choice of most contact lens wearers
for their comfort. They are usually easy
to insert and fit comfortably and securely.
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Soft
contact lenses come in two basic
forms; daily wear and extended wear.
Daily wear lenses must be removed,
cleaned and stored every day. These
are the least expensive. They should
not be worn while sleeping. Extended-wear
lenses are designed for overnight
wear. There is a greater risk of
corneal infections
with any overnight wear of contact
lenses. Depending upon how frequently
soft contact lenses need to be replaced,
they can be daily, weekly, fortnightly,
monthly, or quarterly type.
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Soft
contact lenses are available in
different colors, in both power
as well as plano. These lenses can
change the appearance of your eye
color to varying degrees. Generally,
enhanced contacts change light colored
eyes, while the opaque contacts
change dark colored eyes. |
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Toric soft contact lenses have
both a spherical and cylindrical component.
These lenses can correct astigmatism,
although sometimes not as well as RGP
lenses. They come in many different materials,
sizes and shapes. They can be worn on
a daily wear or extended wear basis. They
usually cost more than other contact lenses. |
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Bifocal
soft contact lenses provide both distance
and near vision. These lenses are somewhat more
difficult to fit and may not provide satisfactory
vision to all people. Some people like monovision
correction to overcome their need for near vision
contact lenses. |
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Fitting Exams
You'll find that our contact lens evaluations
and examinations are thorough. With proper
contact lens evaluation and follow up, we
determine if you can wear contact lenses
safely and comfortably. We also determine
the contact lens wearing schedule that is
best suited for your unique lifestyle. It
helps you look your best and perform to
maximum efficiency. Our contact lens examination
includes a thorough evaluation of corneal
curvatures, tears, cornea, and lid health.
It is essential that we measure the curvature
and topography of the cornea
prior to |
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designing the contact lenses.
During an extensive trial lens fitting, we’ll
try several different lens types for fit and compatibility.
Ongoing evaluations are conducted until you are
completely satisfied. |
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Contact Lens Care & Risks
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Proper Care of Contact
Lenses |
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Any
contact lens that is removed from the eye
needs to be cleaned and disinfected before
it is re-inserted. There are a wide variety
of contact lens solutions on the market.
Your eye doctor can suggest the best solution(s)
for you, depending on type of lens you use,
any allergies
you might have, and whether or not your
eyes tend to form protein deposits. Care
of contact lenses includes cleaning their
case as well, since it is a potential source
of infection.
The case should be rinsed with water, wiped
and allowed to dry. |
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Saline Solution:
It is designed for
rinsing off your contact lenses. Since it does
not kill bacteria, it is not recommended for storage
of your contacts.
Disinfecting
Solution: It
is designed for storage of your contacts, it kills
bacteria. It is available as a single solution
or a multi-purpose solution.
Multi-purpose
Solution:
This solution is a mixture of a disinfectant and
a daily cleaner. These solutions make the daily
routine of cleaning easier.
Daily
Cleaner: It
is a solution which mechanically removes bacteria
and deposits from the contacts by manually rubbing
the contact lens.
Enzymatic
Cleaner: This
is a cleaner which chemically removes deposits
from contacts.
Re-wetting
Drops: These
are designed to moisten your contacts when dryness
occurs.
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Tips
on Caring for Your Contact Lenses: |
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Always
wash and dry your hands before you handle
your contacts. This will keep the contacts
free of skin oil, dust, and sweat. |
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Always
pick up your contacts with your fingertips.
Avoid using your fingernails which can scratch
or tear the lens. |
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Do
not re-use the contact lens storing solution. |
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While
wearing contacts, avoid irritating or toxic
fume environment. |
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Do
not bring soaps, cosmetics, perfumes, or
hair care products in touch with your contacts. |
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Contact
Lenses and You |
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You
may not be a good candidate for contacts if you
have:
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Frequent eye
infections; |
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Severe allergies; |
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Dry
eye that is resistant to treatment; |
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A very dusty work environment; |
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An
inability to handle and care for the lenses. |
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Risks
of Wearing Contact Lenses |
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Contact
lenses that are not properly cleaned and disinfected
increase the risk of infection
of the eye. Lenses that are old or not properly
fitted may scratch the eye, or induce blood vessels
to grow into the cornea. Because a thin lens can
warp over time, and the cornea can change shape,
the fit of the contact lens and the power should
be re-evaluated on a regular basis. Any medicated
eye drops can react with contact lenses, it is
best to avoid the use of eye drops while the contact
lenses are worn, except for wetting drops recommended
by your eye doctor.
Please call us toll free at 1-877-NEOVISION
(1-877-636-8474) for more information
about contact lenses. We can recommend eyewear
that most enhances your appearance and recommend
contacts most suitable for your prescription.
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