By 2020, there are five<unk> s in use and under development: KAMRA The KAMRAinlay (AcuFocus, Inc.) is a biocompatible ring that increases the visual depth of field using the physical principle of a small aperture. This design only allows focused light to enter the eye resulting in an improvement in near and intermediate vision while maintaining distance vision. The KAMRA is the first small aperture<unk>  approved by the US FDA. FlexivueMicrolens The FlexivueMicrolens (PresbiaCoöperatief U.A.) is a refractive hydrophilic polymer lens. The central zone of the lens is free of refractive power and the peripheral zone has a standard positive refractive power. This<unk>  works on a similar principle to bifocal glasses. The bifocal design provides two images to the retina simultaneously. Each specific point of focus is delivered as both a sharp and a blurred image. The FlexivueMicrolens is available in a variety of powers, and can be exchanged as presbyopia progresses. Raindrop The Raindrop Near Vision<unk> , formerly known as the PresbyLens or Vue+ lens (ReVision Optics, Inc) is a thin transparent biocompatible hydrogel implant. It is 2 mm in diameter and varies in thickness from 10 microns in the periphery to ~30 microns in the center. It is implanted under a femtosecond laser flap onto the stromal bed of the cornea, centered over a light-constricted pupil. The Raindrop Near Vision<unk>  reshapes the central region of the cornea to provide a zone of increased power for focusing on near objects. Icolens The Icolens System (Neoptics AG) is another refractive hydrophilic polymer lens, similar to the Flexivue Microlens, with no power in the center and the peripheral zone has positive refractive power. This<unk>  is also available in assorted powers, which may be exchanged as required due to the progression of presbyopia. Diffractive<unk>  The Diffractive<unk>  (DCI) is a novel type of corneal implant for the treatment of presbyopia, which based on the diffraction phenomena.It was developed by de Diffractive Optics Group (DiOG, Spain) and its working principle combines the pinhole and photon sieve effects. Using diffraction, the DCI is able to generate a diffractive focus in near vision. There are several scientific studies that compare the optical properties of DCI with the Kamra<unk> , demonstrating that DCI obtains a better performance in near vision.
Corneal inlay
Pre-Descemet's Endothelial Keratoplasty
Comedo extraction
Intrastromal corneal ring segment
Artificial iris
Epi-LASIK
Eyepatch
Antimonial cup