Living Eye Implant Uses Lab-Grown Cells to Restore Sight
Scientists were able to take samples of corneal cells from subjects’ eyes and cultivate the cells in a lab. Cells were regenerated and multiplied on a synthetic hydrogel film, then the film was implanted back into subjects’ eyes. At 50 micrometers, the film is similar in thickness to the average contact lens.
Its lab-grown corneal cells get to work restoring the balance of liquid below the cornea, and within two months the synthetic film biodegrades, leaving the healthy cells behind to continue maintaining the cornea’s moisture balance.
It’s important to note this procedure hasn’t been tested on humans, but it did restore vision in animals without causing adverse immune reactions. Clinical trials in humans are on track to start as soon as 2017, with life-changing implications for people suffering from corneal opacity.
And it’s not only people with this condition who can place new hope in technology; artificial solutions for different vision complications are advancing as quickly as biological solutions.
In 2013, the FDA approved the first bionic eye implant to treat retinitis pigmentosa, an inherited eye disease that causes the retina’s photoreceptor cells to degenerate. Users of the technology wear a pair of glasses equipped with a tiny video camera. Data goes from the camera to a video processing unit to a group of electrodes implanted on the retina. The electrodes transform the data into electrical impulses that stimulate the retina to produce images.
A procedure to counteract age-related macular degeneration, the leading cause of blindness in people over 55, removes the eye's natural lens and replaces it with a pea-sized telescopic lens that magnifies objects and projects images onto the retina’s remaining healthy area (portions of the retina cease to function normally in people with this condition).
These technologies have already helped restore sight to thousands of people, but they have a ways to go before reaching the biological equivalent of the human eye’s perfect vision. Patients with retinal or lens implants have reported issues like poor resolution, difficulty detecting high-speed motion, and a limited field of view. The retinal chip cannot yet display color, capturing images only in black and white.
With continued advances in both biological vision treatments like corneal cell regrowth and artificial solutions like the bionic eye, blindness could one day be an affliction of the past.