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 Because of circle of least diffusion, the distant vision is comparatively good in and explain in detail?
At point D, the divergence of veical rays is exactly equal to the convergence of the horizontal rays from the axis. So here the section is a circle, which is called the circle of least diffusion. Mixed astigmatism: refers to a condition where in the light rays in one meridian are focused in front and in other meridian behind the retina. Thus in one meridian eye is myopic and in another hypermetropic. Such patients have comparatively less symptoms as &;circle of least diffusion&; is formed on the retina. Reference :- A K KHURANA; page:-25,26,37