Convergence insufficiency is a moderately common vision problem that affects the ability to comfortably focus on close objects. One of the treatments for this condition is to perform convergence exercises with a Brock String if prescribed or recommended by your eye doctor. A Brock String is a simple tool that helps to improve the ability to turn the eyes inward together and focus on close objects.

Contact lenses are prescription medical devices. Even if you just want to purchase cosmetic contact lenses that change your eye color, you will still need an eye exam and a prescription from an eye doctor. The same applies to costume or theatrical contact lenses. Watch the video on how to wear them!