My left eye used to have vibrating fits (muscle spasms?) for about five seconds at a time, many times a day, for years. When I started using these eyedrops (https://www.amazon.com/Eyebright-Drops-Wisdom-Ages-oz/dp/B004THC2SS) for my watery eyes, the eye fits stopped after about a month of use, once in morning/once before bed.....though the drops didn't do squat for the watery eyes.