Gas permeable hard contact lens and its production manner

摘要

PURPOSE: To provide a method which adapts the gas-permeable hard contact lens to a treated person and the gas-permeable hard contact lens which suitably matches the treated person. CONSTITUTION: The method which adapts the gas-permeable hard contact lens to a prescription is provided and the method consists of respective steps. Namely, (1) an optical correction degree which has a different BCOR value is supplied to a group of the same lenses and 2) an adequate BCOR value is decided while the treated person wears the lens; and (3) optical correction based upon the prescription of correction needed for the treated person is determined and (4) a lens is formed which has the same shape and wearing characteristics with the tested lens and is adjusted to the prescription of the degree of the correction obtained from the basic degree given with diffracting power. Consequently, the treated person can obtain the lens which has a satisfactory BCOR value and conforms with the prescription.