Contact lenses are great if your only issue is nearsightedness or farsightedness, but for those struggling with age-related macular degeneration (AMD), a leading cause of blindness among older adults, those flimsy little lenses ain't going to cut it — or at least not the kind of contact lenses you're used to. But soon AMD sufferers could see their vision vastly improving thanks to a slim, adjustable telescope that sits right in the middle of their eye.
Funded by DARPA, the joint team of researchers from the US and Switzerland were facing the problem of correcting vision loss as a result of retina damage — something that normal contacts, which simply refocus the eyes, do virtually nothing to help. By magnifying an AMD patient's vision though, light is also magnified, allowing it to spread out and hit the parts of the retina that remain intact. But until now any sort of optical magnifier came in the form of a highly intrusive, spectacle-mounted telescope or micro-telescopes that required invasive eye surgery.
The team, led by University of California San Diego Professor Joseph Ford, employed tightly-fitted mirrors in designing a telescope that stands at just over one millimetre thick. While the unobtrusiveness of the new telescope design is impressive in and of itself, the team also managed to create a system that allows for the patient's vision to easily switch from magnified to normal. Thanks to a set of liquid crystal glasses, users can choose to block either the magnifying portion of the contact lens along the rim or the unmagnified portion in the centre. According to the news release:
The liquid crystals in the glasses electrically change the orientation of polarised light, allowing light with one orientation or the other to pass through the glasses to the contact lens.
The contacts themselves are made out of a material called polymethyl methacrylate (PMMA), an incredibly strong component that allows for the small grooves necessary to fix the abnormal colour that the lens's shape creates. And while these new lenses are an incredible advancement, it wil still be some time before we start seeing them on a consumer level. The same grooves that fix colour also have the effect of reducing the quality of the actual image, and PMMA isn't gas permeable, which would mean that patients wouldn't be able to wear the lenses for any extended period of time.
Still, an actual, functional telescope shaved down to practically nothing is a huge step for improving the quality of life of those suffering from AMD. And once researchers manage to work out the kinks, the world is going to start looking a whole lot brighter. [Business Wire]