This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optics and refraction, Subject name: Ophthalmology
Refractive surgery most commonly performed for myopia- 
Select and explain. 
A. Radial keratotomy, B. LASIK, C. Photorefractive keratectomy, D. Lensectomy
B: LASIK
Answer: B: LASIK 
Explanation: Laser in-situ keratomileusis (LASIK). In this technique first a flap of 130-160 micron thickness of anterior corneal tissue is raised. After creating a corneal flap midstromal tissue is ablated directly with an excimer laser beam, ultimately flattening the cornea . Currently this procedure is being considered the refractive surgery of choice for myopia of up to - 12 D. Reference : A K KHURANA OPHTALMOLOGY,Edition 4,Page-47