Radial Keratotomy (RK) for Nearsightedness
Radial keratotomy (RK) is a surgery to correct nearsightedness. It involves making tiny in the cornea to flatten it. This can help improve distance vision. The may make more to the if you also have astigmatism.
RK is done in a local anesthesia).'s office or a same-day surgery center. Before surgery, your eye will be numbed with eyedrops (
How well surgery works on the first eye may affect how surgery is done on the second eye. That's why manywait up to 6 weeks before treating the second eye. This delay also reduces the risk of spreading an infection to the second eye. While you wait for the second surgery, you will probably be fitted with a for the untreated eye. Wearing glasses with two very different prescriptions would cause distorted vision.
What To Expect
Surgery on one eye takes about 10 to 15 minutes. You will need someone to drive you home. You will also need a ride to the's office the next day.
Thewill check your eye the day after surgery. You will have more follow-up visits throughout the first year after surgery.
After surgery, you may wear a patch oron the eye. You may get a prescription for pain medicine and for to prevent infection and reduce swelling.
- is usually quick. You may return to most of your normal activities within a few days.
- Most people have only mild discomfort. But some people may have pain, aching, throbbing, or a feeling that there is something in the eye for 1 to 4 days after surgery.
- Your vision may be blurry for days to weeks after surgery. Do not drive until your vision has cleared.
- For 2 weeks after surgery, avoid vigorous sports, eye makeup, and activities that may get water in the eye. Your doctor will tell you when you can shower.
In the first 3 months after surgery, your vision may vary slightly over the course of a day. This may last for up to 1 year.
Why It Is Done
RK is done to correct nearsightedness. It may also reduce. But RK is not done very often. Laser surgeries have become more common than surgeries that involve cutting.
RK may be an option if you have healthy eyes with mild-to-moderate nearsightedness (up to about 3 diopters) that is not getting worse with time.
RK may not be an option if you have:
- that is still getting worse. This is often the case with children and teenagers.
- Pathological myopia, which causes rapid changes in vision.
- Changes caused by severe nearsightedness (high myopia) that get worse over time, such as retinal .
- An abnormal or a disease of the .
- A connective tissue disease that might affect healing of the .
- A job or hobby that could be affected by the side effects of RK. For example, RK may not be a good option for people who drive for a or who play contact sports.
How Well It Works
RK works well to reduce mild-to-moderate. But it does not always completely fix this problem. You are more likely to still need corrective lenses after surgery if you had moderate-to-high before surgery.
The greatest problems with RK surgery are that:
- The results are hard to predict. Vision is sometimes a few different than predicted. In contrast, eyeglasses and can correct vision within 0.5 diopter of the desired result.
- The results tend to change over time. RK often causes cause mild farsightedness ( overcorrection). Most people who have RK surgery gradually become more farsighted for at least 8 to 10 years after surgery. This is called the hyperopic shift.
The most common problems from radial keratotomy (RK) include:
- Becoming farsighted after surgery (overcorrection).
- Still being nearsighted after surgery (undercorrection).
- Unstable vision (hyperopic shift).
RK changes the shape of the eye, so you may not be able to wearafter surgery. Also, RK weakens the and makes it easier to injure. This is not the case with other eye surgeries.
Less common problems include:
- A loss in best corrected vision. Glasses or contacts can correct most eyes to 20/20 vision or better. After RK, a few people have less than 20/20 vision. But the vision loss is usually not severe.
- Irregular that causes ghost images or double vision.
- Double vision, trouble seeing how objects are oriented relative to each other, or of fine depth perception.
- Glare, especially at night. This is common in the first 3 months after surgery. It may last longer than 6 months. You may see halos or radiating lines around headlights or street lamps. It may be harder to drive at night. Some people need to wear sunglasses or change jobs because of glare.
Very rare problems include glaucoma, puncture or rupture of the , and infection of the . Infection may occur right after the surgery or up to 3 years later.
What To Think About
It's a good idea to talk to your doctor about all your treatment options. These may include PRK, LASEK, epi-LASIK, LASIK, corneal ring implants, andimplants. Your doctor can help you understand the risks and benefits of each so you can make the best decision.
Most people choose PRK, LASEK, epi-LASIK, or LASIK surgery instead of RK. But RK still works very well for mildand in some other cases.
RK leaves scars on the. These scars may cause problems if you need another type of eye surgery later in life, such as cataract removal.
RK surgery is an elective procedure. That means it's something that you can choose to have done, but it's not medically needed. It also means that most insurance companies will not pay for the surgery. Cost varies, but it can be high.
Current as of:
January 2, 2018