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If you have presbyopia, in which the eye lens loses flexibility and can't change focus to see near objects, you most likely need bi focal reading glasses. If you have presbyopia and are over forty, you most definitely need bifocals. These are the most common reasons for needing bifocal glasses. More than 90 percent of people over the age of forty squint at a newspaper or the menu.
The high-tech lenses of bifocal reading glasses are split into two sections:
* Upper for distance vision
* Lower for near vision
Although people over forty overwhelmingly populate the “I wear bifocals” club, children ages 7 to 12 may need bifocal eye glasses. Children can develop strabismus, a vision problem in which the eyes do not look at the same point at the same time, also known as being cross-eyed, or ambylopia, or “lazy eye.” Some children with strabismus or ambylopia may need to wear bi focal reading glasses.