Assertion: lens's surface | /r/HasProperty | spherical
Facets:
Source sentences:
text: Standard contact lenses have a spherical surface: think of a slice of the side of a beach ball.
text: Aspheric lenses have at least one surface that is neither spherical nor cylindrical.
text: As lenses are made with spherical surfaces light rays that are parallel but at different distances from the optical axis, will fail to converge at the same point.
text: Conventional lenses have a front surface that is spherical, meaning it has the same curve across its entire surface, much like a baseball.
text: Aspheric lenses have at least one surface that is neither spherical nor cylindrical.