The most common procedures are performed with an excimer laser. In photorefractive keratectomy , or PRK, the laser re moves a layer of corneal tissue, which flattens the cornea and allows light rays to focus closer to or even on the retina. Then there's orthokeratology , where you wear special retainer contact lenses that slowly reshape the cornea to correct you myopia over time. Depending on your eyes, these contact lenses may need to be worn only at night. Orthokeratology is controversial in the eyecare community.
Some practitioners report great results.
Others find that the effects don't last very long. Read more about ortho-k. Presbyopia Read about a unique method of myopia control for children. An even newer procedure for correcting mild myopia is the implantation of plastic corneal rings, which also alter the shape of the cornea. One advantage of the rings is that they may be removed in case of a problem or adjusted should a prescription change become necessary.