Changes

A '''lens''' is a sheet of glass or similar transparent material of tapering thickness, which refracts light in order to [[magnify]].  Lenses are used in [[cameras]], [[telescopes]] and [[microscopes]], as well as in [[spectacles]].  Contact lenses are lenses placed directly against the human [[eye]] as an alternative to spectacles.  The eye itself contains a lens which is used to focus.

A '''lens''' is a sheet of glass or similar transparent material of tapering thickness, which refracts light in order to [[magnify]].  Lenses are used in [[cameras]], [[telescopes]] and [[microscopes]], as well as in [[spectacles]].  Contact lenses are lenses placed directly against the human [[eye]] as an alternative to spectacles.  The eye itself contains a lens which is used to focus.