Bifocal Glasses

Bifocal is a kind of glasses that were developed to offset a common vision problem among presbyopic wearers. Bifocal glasses have to be equipped with two focal points. Presbyopia was a common vision problem to those people who were going to fifties or becoming older. This visual problem caused a difficulty in seeing close up objects. People often call this eye problem:” too short arms”, this common phrase describe this symptom vividly. Why they called this? This is because presbyopic patients are used to hold the reading objects at an arm’s length, in which position can they see clearly. The need for bifocal eyeglasses is still driven by another visual problem, either nearsightedness or farsightedness. Some presbyopic patients have got farsightedness or myopia at an earlier age. Without the help … Read entire article »