Health Library
The Health Library is a collection of health and wellness resources created for learning and accessibility. Select a topic below for related health information or search for a topic in the search bar for more information on other medical conditions.
Astigmatism
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Prescriptions for glasses have two main components: shape and power. The shape of a lens determines the type of correction. Concave, or minus, spherical lenses are thicker at the sides than in the middle to correct nearsightedness (myopia). Convex, or plus, lenses are thicker in the middle than at the...