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': '6/6 visual acuity is attained by the age of? \nSelect and explain. \nA. 6 months, B. 1 year, C. 6 years, D. 18 years', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 6 years Eye in postnatal period Fixation stas developing by 4-6 weeks. Critical period for development of fixation reflex is 2-4 months. Development of fixation is completed by 6 months. So there are three points to remember : ? Fixation stas developing - 4-6 weeks (1-11/2 months). Critical period for development - 2-4 months. Binocular vision and eye coordination are established - 3 months Fixation development is completed --> 6 months. Macula is fully developed by 4-6 months. Fusional reflex, stereopsis and accomodationis well developed by 4-6 months. Cornea attains normal adult diameter by 2 years of age. Lens grows throughout life. Full visual acuity (6/6) or (20/20) is attained by 6 years of life.", 'role': 'assistant'}]