Diffractive bifocal lens designs.
Modifying the number, width, depth, and shape of the echelettes in a diffractive bifocal lens will influence the image intensity and quality within the zero, first, and higher order images. By appropriately varying these parameters optimal bifocal lens designs may be achieved.
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D003261:Contact Lenses; D004867:Equipment Design; D006801:Humans; D008027:Light; D055095:Optics and Photonics; D011680:Pupil / Q000502:physiology; D012029:Refraction, Ocular; D012542:Scattering, Radiation