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Laser in-situ keratomileusis
As with many technologies, like cell phones and computers, technical advances in refractive surgery technology have been rapid. Due to blade-less surgery and more accurate lasers and software, the optical results after modern refractive surgery have dramatically improved.
Today, the vast majority of refractive surgery patients have independent vision after surgery that is at least as good, or better, than it was before surgery using glasses and contact lenses.
Why is LASIK necessary?
LASIK uses a laser to treat vision problems caused by refractive errors. You have a refractive error when your eye does not refract (bend) light properly. To see clearly, light rays must be refracted by your cornea and lens. The light lands on the retina which turns light into signals that travel to your brain and become images. With refractive errors, the shape of your cornea or lens keeps light from bending properly. When light is not focused on the retina correctly, your vision is blurry.
Cornea: Clear, dome-shaped window of the eye that focuses light into your eye.
Lens: Clear part of the eye just behind the colored iris that It helps to focus light on the retina.
Retina: Nerve layer at the back of your eye. It turns light into signals to the brain so that you can see.
To improve the focus of light on your retina a laser is used to change the shape of your cornea. LASIK is used to treat myopia (nearsightedness), hyperopia (farsightedness) and astigmatism. LASIK reduces your need for glasses or contact lenses. In some cases, it may even allow you to do without them completely.
What to expect with LASIK
Your ophthalmologist will discuss your refractive surgery options with you based on your vision needs and lifestyle. For example, if you play sports, you probably need clear distance vision from surgery.
You expectations of LASIK should be realistic. People who have LASIK to achieve perfect vision without glasses or contacts might be disappointed. LASIK allows people to do most of their everyday tasks without corrective lenses. However, there is still a chance you might need to wear glasses for certain activities, such as reading or driving at night.
Your ophthalmologist will thoroughly examine your eyes and make sure you are a candidate for LASIK. He will make sure that you do not have eye problems. For example, if you have dry eyes, they may be worse after LASIK.
He will also measure the size of your pupil. If your pupil is very large, you could see halos (rings of light) at night after LASIK.
• Measure and map the surface of your cornea.
Your ophthalmologist will check the thickness of your cornea and take a detailed scan of the cornea’s surface. Your eye surgeon uses these measurements to program the computer-based laser used during surgery.
During the procedure Your eye will be numbed with eye drops. Your eye surgeon will place an eyelid holder on your eye to keep you from blinking.
• Making the flap
Your eye surgeon will place a suction ring on your eye to keep it from moving. You will feel pressure like a finger pressing firmly on your eyelid. At this point, your vision will go dim or black. Blade-less LASIK involves a femto-second laser that creates millions of micron-sized bubbles at pre-determined positions inside the cornea that gently separate the layers of corneal tissue.
• Lifting the flap
After the laser has fashioned the flap with the desired depth, size, orientation and position. The eye surgeon lifts and folds the flap back. Like opening a book.
• Replacing the flap
After reshaping the cornea, your ophthalmologist folds the flap back down into position and smoothes the edges. The flap attaches on its own in minutes, where it will heal in place. The ophthalmologist will place a see-through shield over your eye. You should plan to go home and take a nap or just relax after the surgery. For a few hours, your eyes may feel scratchy or feel like they are burning. You will be given special eye drops.
•Vision after LASIK
About 9 out of 10 people (90%) who have LASIK end up with vision between 20/20 and 20/40-without glasses or contact lenses. It is important to know that LASIK cannot correct presbyopia. This is the normal, age-related loss of close-up vision. With or without refractive surgery, almost everyone who has excellent distance vision will need reading glasses after around age 40. There are other refractive surgery options for presbyopia.
What are the risks of LASIK?
Like any surgery, LASIK has risks of problems or complications. Some people have side effects after LASIK that usually go away over time. However, in rare cases, they may not go away. For example, almost everyone who has LASIK will have dry eyes and changing vision during the day. These symptoms usually fade within a month. For some people, though, they may take longer to disappear or they may remain.
Side effects that are usually temporary:
• eye pain or discomfort (usually for the first 12 hours after surgery)
• scratchy eye
• small pink or red patches of blood on the white of the eye that go away over time
Side effects that usually improve in the first 3 months but can be permanent to some degree:
• hazy, foggy or blurry vision that fluctuates
• halos (rings) or starbursts around lights
• being sensitive to light
Other rare risks include:
• eye infection. Remember research tells us that contact lenses are not always a safer choice than LASIK surgery. Both contact lenses and LASIK are very safe, although there is a small risk of complications from both of them.
• worse vision than before LASIK, even with glasses or contacts
(called loss of best-corrected vision). In a study at Casey eye institute over 10 years and 18000 procedures no patient lost more a small amount (2 lines) of vision.
Also, with LASIK, your vision may end up being under-corrected or over-corrected. These problems often can be improved top up LASIK, glasses or contact lenses.
You may not want to have refractive surgery if you are happy wearing contacts or glasses. Together, you and your ophthalmologist can weigh the risks and benefits of LASIK.
For more information or questions:
Bookings 016 931 0217 Emergencies 082 319 6727