How do Vuity eyedrops for presbyopia work?
Vuity works primarily by shrinking your pupil to the optimal size it needs to be to focus on things that are close, explains ophthalmologist Y. Ralph Chu, M.D., CEO of Chu Vision Institute in Bloomington, MD, and a principal investigator for the FDA approval of the drops. You put them in once a day and they kick in after 15 minutes; the strongest effects last up to six hours, and then start to fade.
Let me back up a sec and explain how eyes ideally work: When you’re young, the lens of your eye is flexible, and refracts when light enters it; a little muscle helps it to change shape as you focus on stuff that’s far away or up close. There’s also another tiny muscle that opens and closes your pupil, to allow the light in. Fast forward to that time of life when you have to hold the votive candle up to the menu — by then your lens is stiffer and so doesn’t refract as much, which means you can’t focus up close and things look blurry.
What Vuity does is kick both of those muscles (the one that shrinks your pupil and the one that bends your lens) into gear. “It’s a dual mechanism of action,” says Dr. Chu. For most patients, he says, the pin-holing of the pupil is what sharpens your up-close focus. “By making the pupil smaller you improve the reading vision because it increases the depth of focus,” he explains.
And people with a still-somewhat-flexible lens (that is, perhaps younger people whose up-close vision is just starting to blur) also get the benefit of more refraction. “It doesn’t freeze your pupil, so your eye can adjust to different lighting situations,” he says. For most people, it also doesn’t noticeably affect distance vision.