You might think nothing of a trip to the optometrist, but for people in remote parts of the world, getting to an eye doctor isn't quite so easy - and that's why a revolutionary new device called the D-EYE could change the lives of millions of people. The World Health Organisation (WHO) estimates that 80 percent of visual impairments suffered worldwide could be prevented or cured through standard eye examinations and care.

The D-EYE is a lens that clips onto the back of a smartphone (right now it works with the iPhone 5, 5s and 6, and the Samsung S4 and S5). It's non-invasive, simple to set up, and requires no power to run, so it can work anywhere. With the accompanying app patients can then film their own examination, which is sent back to a specialist over the web.

Thanks to the innovative mounting bumper, eye lens and retinal imaging system that make up the D-EYE, you can essentially carry an optometrist's fundus camera around in your back pocket. "Conduct routine eye examinations and retinal screenings anywhere for possible detection of a variety of disorders, including the leading causes of blindness - cataracts, glaucoma, diabetic retinopathy and age-related macular degeneration," the inventors explain on the project's official site.