Author Topic: Better Vision Through Surgery,What Is Laser Vision Surgery?  (Read 3964 times)

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Offline Ahmed_07

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Better Vision Through Surgery,What Is Laser Vision Surgery?
« on: August 25, 2012, 11:25:21 AM »

If you need glasses, you've probably heard the buzz about laser surgery for sharper vision. The most common types are LASIK and PRK. This family of surgeries can bring back 20/20 vision -- and reduce or even eliminate the need for glasses or contacts. But vision surgery can have unwelcome side effects. Browse the slides ahead to see whether it might work for you -- and what to expect.

Good Candidates for Vision Surgery

Laser surgery helps people who are nearsighted, farsighted, or have an oddly shaped cornea, called astigmatism, but it's not for everyone. It might work for you if:
Your prescription hasn't changed for at least one year.
Your job allows laser eye surgery.
Your eyes and overall health are good.

Cautions for Vision Surgery

Illnesses that affect healing can make vision surgery a poor choice in some cases. If you have diabetes, HIV, lupus, or rheumatoid arthritis, talk with an ophthalmologist about your best options. Other conditions that require careful evaluation and could make you a poor candidate for surgery include:
Dry eye
Large pupils
Thin corneas

Surgery is not appropriate for people with keratoconus, a cornea disorder.


You May Still Need Glasses

There's no guarantee that you'll be able to toss your glasses completely, even with successful surgery. Reading and driving at night may still require glasses. With a strong prescription, there's a chance you'll still need glasses most of the time after surgery. Standard laser vision surgeries do not treat presbyopia, the blurry close-up vision that starts after age 40. "Blended" or monovision procedures are a newer option for presbyopia.


How LASIK Works

LASIK reshapes the cornea, the clear, rounded surface of the eye, so it does a better job of focusing the light that enters the eye. The eyeball is held in place by a suction ring and the cornea is lifted and flattened. The surgeon cuts a small, hinged flap in the cornea and folds it back. Then an excimer laser -- an ultraviolet light beam -- reshapes the cornea based on your pre-op eye exam. The corneal flap is folded back in place.


Wavefront-Guided LASIK

This newer form of LASIK is more precise than standard LASIK. It's also more expensive. Before surgery, the doctor creates a detailed map of your eyes using an "aberrometer." This records even the tiniest imperfections in the cornea. In theory, this method gives better results and better vision. And in some studies, wavefront patients reported less trouble with night vision than those who had conventional LASIK.


PRK, Epi-LASIK, and LASEK

Surgeons operate directly on the surface of the cornea in these laser eye surgeries, rather than working under a flap. These procedures correct the same vision problems as LASIK, but may be a better option for people with thin corneas or preexisting dry eyes. Recovery time is longer and less comfortable than for LASIK. Patients usually wear a contact lens "bandage" for three to five days after the procedure.


Strong Rx: Implantable Lenses

If you can't get laser surgery because of a strong prescription, artificial lenses -- called phakic intraocular lenses (PIOLs) -- may be an option. They're FDA approved for treating nearsightedness. The lenses are made of silicone or plastic and are surgically placed in front of the eye's natural lens. Possible risks include loss of vision, night vision problems, and additional surgery to adjust, remove, or replace lenses.


Risks of Laser Eye Surgery

No surgery is risk-free. Many of the common side effects, such as dry eye or other discomforts, clear up within days to a few months. But some can require further surgery or cause permanent damage. Some of the more common risks of LASIK and PRK include:
Permanent dry eye
Halos, glare, or double vision -- making night driving difficult
Over- or under-correction of vision, requiring glasses or contacts after surgery
Markedly reduced vision or, very rarely, loss of vision


How to Choose an Eye Surgeon

Ask friends who've had successful surgery.
Look for a doctor with at least 200 surgeries and who tracks patients carefully afterwards.
Price is important, but your eyes are more so. Avoid offers that sound too good to be true.
How many patients are turned away? A doctor who's careful about screening out poor candidates will turn away more than 10%.

What to Expect During Eye Surgery

Laser eye surgery usually takes less than 30 minutes. Your eyeball will be numbed, but you'll remain awake. You may feel pressure, but should not be in pain. Your vision will dim during the procedure, and you may notice a burning smell as the laser works on your cornea. Afterwards, you'll wear a shield or bandage to protect your eyes, which may itch or burn, and you'll use eye drops for a few days or weeks.


Preparing for Surgery

Once you've decided on laser eye surgery, your doctor may recommend self-treating for dry eye or inflammation before the surgery. You may also follow these steps:
One-two months before: Stop wearing contacts.
One day before: No creams, lotions, makeup, or perfume.
The day of: Scrub your eyelids to remove debris.

Early Recovery From Surgery

You'll see your doctor one to two days after surgery, and most people will be able to drive to the clinic. It is very important not to rub your eyes during recovery. It's best to skip vigorous activities for three to seven days, depending on the type of surgery. Avoid makeup and lotions around the eyes for about two weeks. For a few days after surgery, you may have:
Discomfort or mild pain
Watery, tearing eyes
Fluctuations in vision
Hazy or blurry vision

Full Recovery Timeline

Your vision may take as long as six months to stop changing after surgery, particularly problems with glare, starbursts, halos, or light sensitivity. Here's a general timeline:
Days one to three: itching, burning, mild pain and discomfort, tearing
First week: hazy, blurred vision and sensitivity to light
Weeks one to four: dry eye, glare, trouble with night driving
First six months: changes in vision and regular checkups

How Effective Is LASIK?

LASIK has a high success rate, especially for nearsightedness (myopia). Follow-up studies suggest:
94% to 100% of myopia patients get 20/40 vision or better.
10% to 20% of all patients need another surgery.
One in five patients report having dry eye after surgery.

Partial vision loss affects 1% to 5% of patients, and a weakening of the cornea, called ectasia, affects a small number of patients.


PRK and LASEK Success Rates

Follow-up studies suggest:
70% of PRK patients achieve 20/20 vision.
92% of PRK patients get 20/40 vision or better.
PRK works better for low to moderate farsightedness than high.

LASEK success rates are similar to LASIK for low to moderate nearsightedness.

Higher Order Aberrations (HOAs)

These vision problems are much less common than being nearsighted or farsighted, but they're harder to correct. And laser eye surgery can sometimes worsen HOAs that were mild before the surgery, including halos, glare, and ghosting. These can make night driving difficult. Wavefront LASIK may be better than standard LASIK in preventing this side effect -- but all laser eye surgeries carry the risk of causing them.


Sizing Up Laser Vision Surgery

Most people who have LASIK are satisfied -- even delighted -- with the results. As many as 20% of patients may require another surgery to get 20/20 vision. Second surgeries may give you sharper vision, but they rarely correct HOAs from the first surgery. Procedures to treat HOAs are still being studied by the FDA and may not be advisable for some people.


source...dailymedicalinfo.net


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