TWI769805B

• Main Author: XIAO, XU-GUI
• Format: Patent
• Language: Chinese
• Published: 01.07.2022
• Subjects: CONTACT LENSES; OPTICS; PHYSICS; SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES

A continuous zoom contact lens with peripheral myopia defocus includes an optical zone, a depth of field (DOF) range and a defocus zone. The optical zone is centered on a hypothetical central optical axis. A diopter of the optical zone changes continuously from a circular area outside the hypothetical central optical axis. A first diopter of the optical zone forms a corresponding first focal length. A second diopter of the optical zone forms a corresponding second focal length. The depth of field (DOF) range is a difference range between the first focal length and the second focal length. The quality of an image formed within the depth of field is better than the quality of an image formed outside the depth of field. The defocus zone is another circular area extending outward from the optical zone. A diopter of the defocus area changes continuously from the side close to the optical zone to the side far away from the optical zone. The present invention has the advantages of relieving eyeball pressure and slow