This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'Radial keratotomy is used as treatment modality for: \nSelect and explain. \nA. Small degree in myopia, B. Progressive non healing ulcer, C. High astigmatism, D. High hypermetropia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Small degree myopia Radial Keratotomy is used for myopia of 1-6D.Q Treatment of Myopia Surgery Range of myopia * Methods to induce flattening of central cornea 1. Radial keratotomy 1-6 D 2. Photorefractive keratotomy (PRK) 1-6 D 3. Automated lamellar keratectomy (ALK) 6-32 D 4. Excimer Laser Assisted Insitu Keratomileusis (LASIK) 2-12 D (upto 30 D) 5. LASEK 1-6 D 6. Intracorneal rings (ICR) 1-6 D * Methods to reduce overall refractory power of eye 1. Clear lens extraction > 15 D', 'role': 'assistant'}]