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Thanks to medical and surgical advancements in recent years Cataract Surgery has
become one of the most successful, sophisticated & safe medical procedures performed.
The Cataract Clinic at KENIA EYE HOSPITAL is widely recognized
for excellence in cataract surgery. With successful cataract treatment your vision
will be clearer, brighter, and sharper than it's been for a long, long time. It
is a Day Care procedure and does not require you to be in the Surgery Center for
more than an hour. You can resume most of your routine activities like walking,
reading, watching TV, etc from the next day after cataract surgery.
What is a Cataract?
A cataract is a loss of transparency, or clouding, of the normally clear lens of
the eye. This lens is a part of the eye that helps focus light on the retina. It
is located behind the iris. The term cataract is derived from the Greek word cataractos,
which describes rapidly running water. When water is turbulent, it is transformed
from a clear medium to white and cloudy. Cataract development is usually a very
gradual process of normal aging but can occasionally occur rapidly. Many people
are in fact unaware that they have cataracts because the changes in their vision
have been so gradual. Cataracts commonly affect both eyes, but it is not uncommon
for cataracts in one eye to advance more rapidly. Some children develop cataracts,
called congenital cataracts, before or just after birth; these are usually dealt
with differently from cataracts in adults.
What causes Cataracts?
The lens of the eye is located immediately behind the iris and is responsible for
33% of the eyes focusing power. At birth it is like jelly, but unfortunately with
age it gradually hardens and loses its ability to change shape. Evidence of this
hardening normally starts to affect us in our mid-forties when many require reading
glasses for close work. This is called Presbyopia. The lens is made mostly of water
and protein. Specific proteins within the lens are responsible for maintaining its
clarity. Over many years, the structures of these lens proteins are altered, ultimately
leading to a gradual clouding of the lens. Rarely, cataracts can present at birth
or in early childhood as a result of hereditary enzyme defects, and severe trauma
to the eye, eye surgery, or intraocular inflammation can also cause cataracts to
occur earlier in life. With further increase in age, the lens continues to harden
and starts to become more compact and cloudy, reducing initially quality of vision
and later obstructing vision and interfering with day to day activities. A cloudy
of opaque lens is called a cataract and unfortunately is inevitable.
What are Cataract symptoms?
The typical symptom of cataract formation is a slow, progressive and painless decrease
in vision of variable degrees. The loss of transparency of the lens may be so mild
that vision is hardly affected, or so severe that no shapes or movements are seen.
Common symptoms of cataract include.
A painless blurring of vision
Glare, or light sensitivity
Frequent eyeglass
Prescription changes
Double vision in one eye
Needing brighter light to read
Poor night vision
Fading or yellowing of colors
When to Seek Medical Care- Eye-care professionals may mention during a routine eye
exam that you have early cataract development even if you are not yet experiencing
visual symptoms. Although your doctor will be able to tell when you first begin
to develop cataracts, you will generally be the first person to notice changes in
your vision that may require cataract surgery. Clouding of the lens may start to
be seen at any age, but it is uncommon before the age of 40. However, a large majority
of people will not begin to have symptoms from their cataracts until many years
after they begin to develop. Since cataract development rarely causes any long-term
damage to the eye, cataract surgery should be considered only when visual symptoms
begin to develop. Whenever significant vision problems are noted, you should schedule
an exam by an eye-care professional. Typical symptoms may include blurry vision,
difficulty with glare or night vision, poor color vision, or frequent changes in
eyeglass prescription. For an early cataract changes, vision may be improved by
simply changing your eyeglass prescription, using a magnifying lens, or increasing
lighting when you do visually demanding tasks. Eventually, cataracts get to a point
where the only effective intervention is surgery. This decision is made based mainly
on the degree of visual limitation the patient is experiencing.
THESE RISK FACTORS INCLUDE
Age. Most people older than 60 years have cataracts.
Medical conditions. Diabetes and other systemic diseases, glaucoma, and metabolic
abnormalities can cause cataracts. We can work to control these causes.
Eye injuries. These are called traumatic cataracts. A blow to the eye, great heat
or cold, chemical injury, exposure to radiation and other injuries can lead to cataract
formation. We can limit this with immediate treatment.
Ultraviolet radiation (UVA or UVB). Long-term exposure to sunlight is believed to
speed the development of cataracts. We can help prevent this with proper protection
in your glasses.
Oral steroids and other medications. Oral steroids (such as prednisone), the gout
medication allopurinol, the breast cancer drug tamoxifen, the heart medication amiodorone,
and the long-term use of aspirin have also been associated with cataracts. We can
monitor your eyes for this.
Smoking. All studies indicate that smokers are twice as likely to develop cataracts
as nonsmokers and that quitting can reduce the risk for developing cataracts. We
will try to help you with this.
Exams and Tests
To detect a cataract, the eye-care provider examines your lens. A comprehensive
eye examination usually includes the following:
Visual acuity test: An eye chart test is used to measure your reading and distance
vision.
Refraction: Your eye doctor should determine if glasses would improve your vision.
Glare testing: Vision may be significantly altered in certain lighting conditions
and normal in others; in these circumstances, your doctor may check your glare symptoms
with a variety of different potential lighting sources.
Potential acuity testing: This helps the ophthalmologist get an idea of what your
vision would be like after removal of the cataract. Think of this as the eye's vision
potential if the cataract was not present.
Contrast sensitivity testing: This check for your ability to differentiate different
shades of gray, which is often this limited by cataracts.
Tonometer: a standard test to measure fluid pressure inside the eye (Increased pressure
may be a sign of glaucoma.)
Pupil dilation: The pupil is enlarged with eye drops so that the ophthalmologist
can further examine the lens and retina. This is important to determine if there
are other conditions which may ultimately limit your vision besides cataracts.
IOL Master: A new dimension in optical biometry to improve postoperative refractive
results. It is a gold standard in biometry (calculating IOL power)
Today, cataract treatment involves a lot more than the replacement of the crystalline
lens. Refractive improvement is often also required. Premium IOL are now being increasingly
used to meet patient demands. Hence accurate IOL power calculation is an absolute
must. The IOL Master provides you with highly precise measuring data as a basis
for optimum vision for patient.
The IOL Master can also be used to precisely and reliably measure problematic cases
such as staphyloma, highly myopic, or silicone-filled eyes.
The Haigis-L formula offers a convenient solution for eyes subsequent to refractive
surgery performed for the correction of myopia and hyperopia. The calculation of
phakic implants is also possible.
How is Cataract Treated?
Cataract Surgery is the only way a cataract can be removed.
Your doctor can examine you and tell you when you need surgery for cataract. Replacing
it with an artificial intraocular lens at the time of cataract surgery helps in
restoring vision to normal No medications, exercises or dietary supplements have
been shown to prevent or reduce cataracts. Cataract surgery should be planned when
cataract cause enough loss of vision to interfere with daily activities. It is not
advisable to postpone surgery too long,
as it can cause hardening of cataract. Sometimes,
the cataract may become hyper mature and can lead to complications in the eye. Cataract
surgery through phacoemulsification is the most modern and advanced method for performing
cataract surgery.
What are the different types of intraocular lenses implanted after cataract
surgery? There are a variety of intraocular lens styles available for
implantation, including monofocal, Toric, and multifocal intraocular lenses.
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