aspherical


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aspherical 

Literally 'not spherical' but this term is usually restricted to surfaces of revolution having identical but non-circular (e.g. parabolic) sections in all meridians (British Standard). See aspherical lens.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
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The MX-1700 ZOOM is the first digital camera of its kind to have an all-glass aspherical zoom lens.
Until this year, the only Docter-Optic riflescope available with aspherical lenses was the 8x56mm fixed-power model.
Aspherical Optical Technology eliminates image distortions and provides corner-to-corner sharpness.
The new 42mm lightweight binocular series from Minox features aspherical lenses for a sharp, high contrast, detailed image over the entire field of view.