Annular mask contact lenses

(57) A summary contact lens (10) is designed to operate with the usual function of man's pupil. An annular mask (18) forms the opening (20) of the shape of a small pinhole of a contact lens (10), and enables continuous focal compensation. As for an annular mask (18), more light energies penetrate a pupil as a brightness level falls. A contact lens (10) can be constituted so that two optical compensation may be performed in the domain which exceeds an annular mask in a small opening domain. Therefore, image formation nature functional about bright conditions, dark conditions, and the view distance of the wide range is attained. The eyesight of cosmetics and the circumference can be reinforced with the contact lens constituted by the present invention.