Clip-ons and fit overs compete in the market as they share one main factor for the desirability: both are simple to wear over prescription lenses. Prescription lenses are notorious for being hard to convert into sunglasses. Clear lenses are required to see clearly in any type of lighting. However, when a glare hits your eyes your concern is now glare protection. This is where fit overs and clip-ons come in to play. One point of contention is whether the build of your face will handle either the fit-overs or the clip-ons. Either one can be convenient and depends on design and how the upper area of your face is shaped. If your nose is prominent you might do better with a fit-over that will fit properly on the lower part of your nose when allowing you to wear your prescription lenses underneath. In case the bridge of your nose is prominent, then clip-on lenses are advisable. Most of the fit over sunglasses are lightweight, so the issue of whether clip-ons are lighter than the fit-overs is moot.