Many friends choose to wear eyeglasses online cheap, which is understandable. As long as you understand glasses, it is not impossible. However, many times there is no reasonable "choice".

The presbyopia lens is a convex lens with a thick center and thin edges, without any protection below the half frame. After slotting by a slotting machine, it is fixed with a wire drawing. Especially the outer part, which is very thin and has grooves, is naturally prone to edge collapse. This is not a quality issue, it is an unreasonable choice. A reasonable choice is a full frame. Alternatively, PC presbyopia lenses can be paired with a half-frame frame. 

If the frame of the presbyopia lens is too large, likely, the actual pupil distance cannot be achieved. The larger the diameter of the lens blank, the thicker the lens, with the same degree and refractive index.

To achieve pupil distance, sometimes it is necessary to choose larger diameter lenses, which naturally result in thicker lenses. A reasonable choice is to have a small frame, then calculate the minimum required diameter and choose the smallest possible diameter, which can match with lighter and thinner discountglasses.

The effect of small-diameter lenses on thickness instantly surpasses the effect of a high refractive index purchased at a high price. You don't need to choose high-refractive index lenses to achieve the goal of being lightweight.

Myopia discount prescription glasses lenses are concave lenses, with a thin center and thick edges, so they will not be thin. If you choose a large frame for high myopia, it is still very thick and heavy, easy to slide, press your nose, and have a poor wearing experience. A reasonable choice is a small frame with high refractive index lenses.