Multi-focal intraocular lens, and methods for making and using same

Abstract

An intraocular lens is provided that includes an optic body having anterior and posterior walls, a chamber, and optically transmissive primary and secondary fluids, and method for making and using the same. One of the fluids is a gas. The secondary fluid is substantially immiscible with the primary fluid and has a different density and a different refractive index than the primary fluid. The primary fluid is present in a sufficient amount that orienting optical body optical axis horizontally for far vision positions the optical axis through the primary fluid, thereby immersing the anterior and posterior optical centers in the primary fluid. The secondary fluid is contained in the optic body in a sufficient amount that orienting the optical axis over a range of effective downward angles relative to the horizontal for near vision positions the optical axis to extend through the primary fluid and the secondary fluid, thus changing the focus of the intraocular lens.

1 . An intraocular lens for a human eye, the intraocular lens comprising: 
 an optic body sized and configured to be received in the human eye, the optic body comprising an anterior wall with an anterior optical center, a posterior wall with a posterior optical center, and a chamber between the anterior wall and the posterior wall, the optic body having an optical axis intersecting the anterior wall at the anterior optical center and the posterior wall at the posterior optical center;    an optically transmissive primary fluid having a first density and a first refractive index, the primary fluid being contained in the chamber of the optic body in a sufficient amount that orienting the optical axis in a horizontal orientation for far vision positions the optical axis through the primary fluid and immerses the anterior and posterior optical centers in the primary fluid;    an optically transmissive secondary fluid substantially immiscible with the primary fluid and having a second density and a second refractive index that are different than the first density and the first refractive index, the secondary fluid contained in the chamber of the optic body in a sufficient amount that orienting the optical axis for near vision at a range of effective downward angles relative to the horizontal orientation positions the optical axis to extend through the primary fluid and the secondary fluid; and    a supplemental internal lens element between the anterior wall and the posterior wall,    wherein whichever of the primary fluid and the secondary fluid has a lesser density is a gas.