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Approximately 50% of the world’s population requires some form of vision correction. In 1993, it was estimated that 50 million people worldwide choose to wear contact lenses as the primary means of obtaining clear vision.
If so, you are nearsighted, or myopic, and this information is provided to help you decide whether or not you want to have your near sightedness corrected or partly corrected with KeraVision™ Intacs.
Intacs PDF
What is nearsightedness?
In the nearsighted eye, light rays focus in front of the retina because the curvature of the cornea is greater than that of a normal eye, or the eyeball is longer than an average eye. People with nearsightedness see nearby objects clearly, but distant objects appear blurry. During a regular eye examination, your doctor uses lenses to measure your nearsightedness in units called “diopter”.
Nearsightedness can be corrected by glasses, contact lenses and various types of refractive surgery.
KeraVision™ Intacs Intra Corneal Ring Segments (ICRS) is a way to achieve vision correction by reshaping your cornea (the clear front surface of the eye), thereby correcting its refraction (optical power). Intacs for myopia are tiny and virtually invisible arcs that are meant to remain permanently within your cornea. However, they can be removed or replaced.
Your doctor places Intacs in your cornea during a short outpatient surgical procedure that does not involve a laser. You may notice an improvement in your uncorrected vision (without glasses) already the next day.
The procedure for placing Intacs does not involve the cutting of flaps or removal of tissue from the cornea’s central optical zone – that part of the cornea that is most important for your vision. Your doctor can help you decide what is best for you.
How the eye functions
In order to understand how Intacs will help to correct your nearsightedness, it is important to understand how the eye functions.
The cornea of the eye is composed of transparent tissue and is comparable in size to a contact lens. The cornea functions as a window through which light rays travel to the retina in the back of the eye. The retina sends this “picture” of the viewed object to the brain where the object is then “seen”. In the normal eye with perfect vision, the light rays enter the eye and are focused precisely on the retina. In this situation, a clear image is sent to the brain. The cornea provides about 75 percent of the eye’s focusing or refractive power. The natural lens inside the eye provides the remaining focusing power. The shape, or curvature, of the cornea determines how well you see and how “in focus” an image is when it reaches the retina. Nearly all of the light that reaches the retina must pass through the central area of the cornea or the “optical zone”. Because the optical zone is so crucial or clear vision, Kera Vision Intacs were designed to be placed at the outer edge of the cornea, away from the optical zone.
What are KeraVision Intacs?
KeraVision Intacs are two small, transparent crescents or arcs. They are made of the same material (PMMA) which has been safely used for over 50 years as intraocular lens material to treat patients with cataracts (clouding of the eye’s natural lens).
KeraVision™ Intacs are designed to remain permanently in the eye, yet they can also be removed or replaced. The KeraVision procedure is typically performed in an outpatient setting using drops to numb your eye. It takes approximately 15 minutes to place KeraVision Intacs in your eye. The total procedure for one eye, including preparation tine, is usually completed in less than one hour. Intacs are surgically placed through a tiny cut that is made to create space for Insert in the corneal tissue. Once in place, the two arcs flatten the cornea so that light rays can properly focus on the retina. Since KeraVision Intacs are inserted peripherally in the cornea, the center of the cornea remains untouched.
What are the benefits of KeraVision™ Intacs?
Intacts reduce or eliminate –1.00 to –3.00 diopters of nearsightedness. If you have this range of nearsightedness with 1.00diopter or less of astigmatism (uneven shape of the cornea that reduces any distant vision), you may benefit from Intacs.
Intacs correct nearsightedness while preserving the central part of the cornea which is most important for your vision. Intacs can be surgically removed or replaced.
What are the risks of KeraVision™ Intacs?
You should NOT have KeraVsion Intacs placed if:
Warnings – Discuss with your doctor if you *have insulin-dependent diabetes or other medical conditions that affect wound healing; or * you have had a Herpes infection in your eyes.
Precautions:
If your nearsightedness is –2.75 to –3.00 diopters, your results may not be as good as those of patients who are less nearsighted. Patients in this range of nearsightedness may be more likely to have Intacs removed due to dissatisfaction with their results.
*If your nearsightedness is –1.00 diopter, you are more likely to be overcorrected resulting in blurred near vision without glasses.
*the long-term effect of Intacs on the cornea has not been established.
*If your pupils are large under low light conditions, you are more likely to experience some visual symptoms such as glare and sensitivity to light.
*Under poor visibility conditions, such as dim light or fog, you may have some reduction in the sharpness of your vision.
*If your Intacs are removed, the results of future surgical procedures to correct your vision are not known.
Are you a good candidate for KeraVision Intacs?
If you are considering KeraVision Intacs, you must
Preparation for Intacs:
Intacs Post operative instructions
PLEASE AVOID TOUCHING YOUR EYES AFTER THE PROCEDURE
After the procedure has taken place, go home and rest or sleep on your back to avoid pressure on your eyes. Try to avoid sleeping on your side.
What should I expect after the surgery?
Precautions to adhere to after the procedure
Your doctor will need to examine your eyes on the first day and then again at one week, one month, 3 months and one year after the LASIK surgery to monitor your progress and change treatment if necessary.
If you suffer from dry eyes , red eyes or conjunctivitis, make an urgent appointment to consult your eye doctor.
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Orthokeratology allows the user to be lens free during the day by the use of night time hard lenses
This eye disease causes distorted vision due to a change of shape in the cornea.
Many children are losing their vision due to excessive “screen time”. Ortho-K lenses can radically reduce the progression of myopia.
LASIK is a quick and painless surgical procedure that corrects the shape of the cornea.
