Contact lens

A contact lens comprising:

• a central optical zone having no deviation of a center of gravity by a prism;
• a peripheral zone surrounding the optical zone;
• a pair of thin portions that are each disposed in the peripheral zone and extend in a circumferential direction, with a constant thickness, on upper and lower sides of the lens during wear;
• a pair of thick portions that are each disposed in the peripheral zone and extend in the circumferential direction, with a larger thickness than the thin portions, on left and right sides of the lens during wear;
• and
• at least one concavity between a first protrusion and a second protrusion of the contact lens such that the concavity and the first and second protrusions are disposed on a posterior surface of each of the pair of thick portions, respective concavities of the at least one concavity being positioned symmetrically in a left-right direction during wear,
• wherein a minimum thickness at a portion where the at least one concavity is disposed is larger than the thickness of the thin portions.