Assertion: snake | /r/CapableOf | sharpen their vision
Facets:
value: by improving the contrasts
type: MANNER
value: probably
type: DEGREE
Source sentences:
text: It's concluded that the last common ancestors of all snakes had UV-sensitive vision, but that most snakes that depends on their eyesight to hunt in daylight have evolved lenses that act as sunglasses which filters out UV-light, and probably also sharpens their vision by improving the contrasts.