In late 2021, the U.S. Food and Drug Administration approved a new eye drop medication to treat presbyopia, which could offer people an easier and safer way to see clearly again
When people get into their 40s and beyond, their close-up vision starts to worsen. For many people, cranking up the font size on a phone or maxing out the brightness on a computer is the only way to be able to read some text.
—people would either need glasses, contacts or eye surgery to alleviate presbyopia. But after learning how these eye drops work, I recognized that for many people, they could offer an easier and safer way to see clearly again.The first thing light hits is the cornea, the clear outer layer that initially bends the light. Then light passes through the iris and pupil, which can shrink or grow to let more or less light into the inside of the eye.
You can simulate this process using a camera on your cellphone. First, point the camera at something in the distance. Then, move your thumb into the image, holding it about 6 inches away. Your thumb will start off blurry, but as the camera’s lens changes shape, your thumb will come into focus. One theory suggests that as lenses age, they get heavier and can’t change shape as easily. Another theory suggests that the muscle that pull on the lens become weaker with age. I suspect presbyopia likely occurs due to a combination of both. Regardless of the cause, the result is that when looking at close objects, people’s eyes are no longer able to bend incoming light enough to direct it at the center of the retina.
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