This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Types of Errors of Refraction, Subject name: Ophthalmology
[{'content': 'Axial myopia is - \nSelect and explain. \nA. Increase in anterio-posterior length of the eyeball, B. Increased curvature of cornea, C. Anterior placement of crystalline lens, D. Increase in refractive index of crystalline lens', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e. Increase in anterio-posterior length of the eyeball Etiological Classification of myopiai) Axial- commonest# Increase in anterio-posterior length of the eyeball# 1mm increase in AXL-3D of Myopia.ii) Curvatural# Increased curvature of cornea, lens or both.# (eg. Keratoconus, Lenticonus)# 1 mm increase in radius of curvature- 6D Myopiaiii) Positional# Produced by anterior placement of crystalline lens in eyeiv) Index# Increase in refractive index of crystalline lens associated with nuclear sclerosisv) Others# Myopia due to excessive accommodation,# Myopia due to relaxed or ruptures suspensary ligament or zonules.", 'role': 'assistant'}]