When letters in morning newspaper becoming blurry, you may get the eye problem of presbyopia. Your eye doctor may advise you to have a pair of bifocal lens as the most easy and economic way back to normal life. At the same time, most prescription glasses are designed to correct only one type of refractive [...]

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What is bifocal lens? Bifocal lens was invented by whom? Maybe some of you have known the answers, I still want to explain it to those who don’t know.
Definition: Bifocal lens are a type of eyeglasses that allow the individual to view close objects and distant objects through separate lenses. These eyeglasses date back to [...]

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If you ask me how many types of bifocal lenses I know, I would give you the answer—only one. That is bifocal contact lenses, which also impresses me most .
Most bifocal contact lenses are gas permeable, meaning they are very rigid so you can feel the facet of crispiness. This ocular aid is smaller in [...]

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