Assertion: lens's surface | /r/HasProperty | smooth
Facets:
value: as with calm water
type: OTHER
Source sentences:
text: But if the surface is smooth, as with calm water or a flat piece of sheet metal, light reflects at one angle—such as right in your eyes.
text: A hard lens produces better vision because it masks all of the corneal distortions, mimicking a new smooth optical surface to focus light.