Assertion: visby lens | /r/CapableOf | range in one case
Facets:
value: to worse than spheric lenses
type: OTHER
Source sentences:
text: The Visby lenses found in Viking treasures on the island of Gotland dating from the 10th or 11th century are also aspheric, but exhibit a wide variety of image qualities, ranging from similar to modern aspherics in one case to worse than spheric lenses in others.