Assertion: glass's surface | /r/HasAspect | counter-curves
Facets:
value: toward their edges
type: LOCATION
value: unlike convex surfaces
type: OTHER
value: unlike spherical concave
type: OTHER
Source sentences:
text: Aspherical (ASPH) surfaces are lens surfaces that, unlike spherical concave and convex surfaces common to most lens elements, have counter-curves toward their edges that help maintain higher levels of sharpness toward the edges of the frame, which is particularly beneficial in the case of wide-angle lenses.