Refractive errors can be corrected by adding a lens or aperture into the cornea. Corneal inlays have promised much but until recently offered no advantage over other forms of refractive surgery.
Recently an inlay called the Kamra Acufocus Inlay has been released to minimise the effects of presbyopia. This inlay is very thin (5 microns), has a donut shape with a 1.6mm internal diameter and a 3.8mm external diameter and over 8000 microperforations within the inlay for nutrient passage into the adjacent cornea.
The inlay works like a pinhole creating increased depth of focus in the non dominant eye of patients with presbyopia. It is placed under a corneal flap created by a femtosecond laser as is used in LASIK. It is frequently combined with LASIK and works best in eyes that are slightly myopic.
Whilst promising, the risks and benefits of this inlay are still being investigated with more conclusive information being expected in the future.