Topic: Trifocal Eyeglasses
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Why do some people where bifocal or trifocal eyeglasses?
200 years ago Benjamin Franklin noted that the glasses needed for seeing up close were not the same as those needed for reading for persons over 42 years old. So he arranged to provide 2 different focal ranges in his glasses. (This happens ... Read More »
Source: http://answers.yahoo.com/question/index?qid=20120314183249AATqG6t
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Trifocal Eyeglasses
Eyeglass lenses have developed over time from single-vision focal lenses to more advanced trifocal lenses. If you have vision problems, especially for perceiving near and far objects or if you find yourself… More »
Source: www.ehow.com
