Patent ID: 8864824

Claim:
A method for correcting vision of an eye of a patient, the method comprising: performing a surgical procedure on the eye; and applying a mask to the eye between a first layer and a second layer of a cornea of the eye, wherein the mask is configured to increase the depth of focus of the patient, the mask comprising an aperture configured to transmit light, a portion configured to be substantially opaque to visible light and to surround at least a portion of the aperture, and a plurality of holes in the substantially opaque portion configured to reduce visible diffraction patterns from visible light that passes through the holes by having irregular locations in the opaque annulus, wherein the plurality of holes comprise a first plurality of the holes having a first hole size, shape, or spacing and a second plurality of the holes having a second hole size, shape, or spacing different from the first hole size, shape, or spacing, and wherein the opaque portion further comprises a central region, an inner peripheral region between the central region and the aperture, and an outer peripheral region between the central region and an outer edge of the mask, the central, inner, and outer regions having holes, at least one of the inner and outer regions having a lower density of holes than the central region.