What is the difference between an aspheric & non-aspheric lens?

aspheric Lens non-aspheric
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What is the difference between an aspheric & non-aspheric lens?

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The front surface of an aspheric lens has curves that gradually flatten or steepen as they move away from the optical center of the lens. A non-aspheric or spherical lens has the same radius curve over the entire surface. Aspheric lenses will provide a better peripheral image and can reduce edge thickness on higher prescriptions.