Bifocal lens which positions within the anterior chamber
Variable power intraocular lens and method of implanting into the posterior chamber
Variable power lens system Patent #: 4601545
ApplicationNo. 06/758331 filed on 07/24/1985
US Classes:623/6.22Including mechanically or electrically activated means on lens to alter focal power of lens (e.g., electromagnet, material which is ablated by laser, etc.)
ExaminersPrimary: Apley, Richard J.
Assistant: Prizant, James
Attorney, Agent or Firm
International ClassA61F 2/16 (20060101)
AbstractAn intraocular lens including an annular Fresnel lens for implant in the anterior chamber, the posterior chamber or in the cornea of the eye. The Fresnel lens can be made of polymethylmethacrylate (PMMA) or a high index of refraction material. The lens is an annular lens with centers of curvature of different rings receding from the axis according to the distance from the center so as to minimize spherical aberration where the only spherical surface is the central part of the lens, that central part can be plano-convex. A composite material can overlay the Fresnel elements providing a smooth entrant surface. The composite material can be a crystalline or other material which changes index of refraction when excited with electrical power or radiant energy.