ISSN: 2578-465X
Authors: Partha Haradhan Chowdhury and Brinda Haren Shah
Astigmatism is a condition where always line image is created. When the parallel rays of light are coming from infinity brought to focus as a line image at different point when accommodation is at rest, condition is known as Astigmatism. The meaning of astigmatism is A- privative and stigma – point. When parallel rays of light are passing through the cylindrical surface then, horizontal meridian creates vertical line and vertical meridian creates horizontal line. The gap between horizontal line and vertical line is called “Focul Interval” or “Circle of Least Confusion”.
Keywords: Astigmatism; Parallel Rays
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