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Phakic intraocular lenses (PIOLs) are artificial lenses that are placed inside the eye. They help change the eyes focusing ability to help you see better without glasses or corrective lenses. Some types of PIOLs are designed to go in front of the iris, some behind. The natural lens is not removed. This procedure may be combined with excimer laser surgery to reshape the cornea. PIOLs may be used to treat severe myopia or hyperopia.
Before treatment, you'll be given local anesthesia. You may also be given medication to help you relax.
A peripheral iridotomy (drainage hole) may be made in the iris to prevent fluid buildup.
An incision is then made at the edge of the cornea. The lens is inserted through the incision either in front of or behind the iris.
After treatment, your eye may be bandaged. Your vision should start to improve the next day. It should become stable in 1–3 weeks.
Implant can be removed or replaced if the desired result is not achieved
Can correct some extreme refractive problems
No loss of accommodation, since natural lens remains in place
No thinning of the cornea
Reduced risk of halos, glare, or starbursts
Long-term effects are still unknown
May increase risk of developing cataracts
If infection or inflammation occurs, serious vision problems may result
Risk of vision loss
Risk of undercorrection or overcorrection
Risk loss of best corrected vision