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 Normal level of visual acuity is attained at which age and explain in detail?
In clinical practice, measurement of the threshold of discrimination of two spatially-separated targets (a function of the fovea centralis) is termed visual acuity Visual acuity recorded by Snellen&;s test cha is a measure of the form sense Reference : A K KHURANA Comorehensive Ophtalmology edition 4,page-16