You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Treatment of presbyopia is by use of which lens? and explain in detail?
Ans. is 'a' i.e., Convex Presbvopia Presbyopia is a vision condition in which the crystalline lens of eye loses its flexibility, which make it difficult to focus on the objects closer to the eye. Presbyopia is not an error of refraction but a condition of physiological insufficiency of accommodation leading to a progressive fall in near vision. Presbyopia is an age related problem, therefore also called eye sight of old age. Symptoms are usually seen after 40 years of age. Presbyopia is not a disease, rather a natural pa of the aging process of the eye. The treatment of presbyopia is the prescription of appropriate convex glasses for near work.