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': 'Retinitis pigmentosa is characterized by ? \nSelect and explain. \nA. Central scotoma, B. Centrocaecal scotoma, C. Tubular vision, D. Isopteric contraction', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Tubular vision Impoant facts Earliest visual field defect in primary open angle glaucoma- Isopeteric contraction. Earliest clinically significant visual .field defect in primary open angle glaucoma --> Paracentral scotoma, Visual field deject in rheugmatogenous retinal detachment- Loss of peripheral field. Visual field defect in retinitis pigmentosa- Tubular vision. Most common visual ,field defect in optic neuritis - Central or centrocaecal. Visual field defect in papilloedema- Enlargement of blind spot and progressive contraction of visual _field. Visual field defect in Leber's optic neuropathy- Centmcaecal. Characteristic visual .field defect in anterior ischemic optic neuropathy- Altitudinal visual field defects.", 'role': 'assistant'}]