Half-rim glasses, also known as simi-rimless eyeglasses, have frames that only surround the top half of the lenses. The bottom of the lens is usually open or held together with a very thing transparent nylon.
Pros: Half-frame eyeglasses offer a more sophisticated and mature look. It also serves as the best of both worlds in that it offers durability as well as lightweight. If you wear your glasses for long periods, this is a great option. These frames are more affordable compared to alternatives such as lightweight full frame glasses because the lighter material required in full rimmed glasses are more expensive.
Cons: Half-rimmed eyeglasses may not be able to accommodate thick correctional lenses. Additionally, Half-rim may not be ideal if your lifestyle is active.