Etymology
The word "astigmatic" is derived from Greek roots, meaning "a" (without) and "stigma" (point).
Meaning
"Astigmatic" refers to a condition of the eye in which the cornea or lens is not perfectly spherical, resulting in distorted vision.
Origin
The term "astigmatism" was first coined by the English physician Thomas Young in 1801. Young was investigating the nature of vision and discovered that individuals with astigmatism had difficulty focusing on both horizontal and vertical lines simultaneously.
Explanation
In a normal eye, the cornea and lens are shaped like a perfect sphere, which allows light rays to focus evenly on the retina. In astigmatism, the cornea or lens is slightly oval, causing light rays to focus on different points. This results in blurred vision, especially for objects at different distances.
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