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Flat-top/Round-top Bifocal Lens
Bifocal lens can be called a multi purpose lens. It has 2 different fields of vision in one visible lens. The larger of the lens usually has the prescription necessary for you to see for distance. However, this can also be your prescription for computer use or intermediate range, as you would normally be looking straight when you view through this particular part of the lens.The lower part, also called the window, typically has your reading prescription. Since you generally look down to read,...