| 摘要 |
A method for use in preparing a customized multifocal contact lens includes the step of providing a standard diagnostic contact lens having an annular portion with a concave cornea-fitting posterior surface and a central portion with a predetermined convex anterior surface and a concave aspherical posterior surface of predetermined eccentricity. The diagnostic contact lens is placed on the cornea of a patient's eye so that the fitting surface is in substantial contact with the cornea. The diagnostic contact lens is allowed to align itself with the cornea in an off-center position. Upon an alignment of the diagnostic contact lens in the off-center position, two or more test lenses are disposed in series before the patient's eye to determine a power curve with which the anterior surface of the central portion could be formed to provide optimal near and far vision for the patient.
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