Once upon a time, when the optical technology is not so advanced as today, people have the only choice to wear those glass material lenses if they have any vision problem, including myopia and hyperopia. Theses lenses are easy to get fragile and uncomfortable to wear, not to say those strong prescription ones. It was a hard time for people whose Rx was stronger than even -7.00! The glass lenses will be specially thick and heavy, actually, eyeglasses should not be a burden for individuals. Today, our manufactures can provide us the high index plastic lenses, which overcome the drawbacks of the glass materials. People wearing prescription eyeglasses were considered to get back to fashion kingdom again, which nowadays are thought to be a important factor of buying glasses! (more eyeglasses…)
