Refractive surgery most commonly performed formyopia ?
**Core Concept**
Refractive surgery is a medical procedure aimed at correcting vision problems by altering the shape of the cornea or lens inside the eye. Myopia, or nearsightedness, occurs when the eyeball is too long or the cornea is too steep, causing close objects to be seen clearly but distant objects to appear blurry.
**Why the Correct Answer is Right**
LASIK (Laser-Assisted In Situ Keratomileusis) is a popular refractive surgery technique used to treat myopia. During LASIK, a thin flap is created in the cornea, which is gently lifted to expose the underlying tissue. An excimer laser reshapes the cornea by removing microscopic amounts of tissue, allowing light to focus properly on the retina. This procedure is effective in correcting myopia because it reduces the steepness of the cornea, enabling distant objects to be seen clearly.
**Why Each Wrong Option is Incorrect**
**Option A:** PRK (Photorefractive Keratectomy) is another type of refractive surgery, but it is not the most commonly performed procedure for myopia. PRK involves removing the outer layer of the cornea and reshaping the underlying tissue with an excimer laser.
**Option B:** Phakic intraocular lenses are a type of refractive surgery that involves implanting an artificial lens inside the eye. While they can correct myopia, they are not as commonly performed as LASIK.
**Option C:** Radial keratotomy is an older type of refractive surgery that involves making radial incisions in the cornea to flatten it and correct myopia. However, this procedure has largely been replaced by LASIK due to its lower success rate and higher complication risk.
**Option D:** Conductive keratoplasty is a procedure that uses radiofrequency energy to shrink the collagen in the cornea, reducing its steepness and correcting myopia. However, this procedure is not as effective as LASIK and is typically used for mild myopia.
**Clinical Pearl / High-Yield Fact**
LASIK is generally considered the most effective and safest refractive surgery option for myopia, with a high success rate and rapid recovery time. However, it is essential to carefully evaluate the risks and benefits of LASIK and other refractive surgery options with an eye care professional before making a decision.
**Correct Answer:** A. LASIK (Laser-Assisted In Situ Keratomileusis)