This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
[{'content': 'Amsler grid test is for \nSelect and explain. \nA. Corneal thickness, B. Macular function, C. Visual field chaing, D. Calculation of squint angle', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Amsler grid test is for testing Macular function. The Amsler grid is a tool that eye doctors use to detect vision problems resulting from damage to the macula (the central pa of the retina) or the optic nerve. The damage may be caused by macular degeneration or other eye diseases, so the Amsler grid is useful in detecting these problems. Reference: AK khurana 7th edition', 'role': 'assistant'}]