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</html><description>trifocals are vision-correcting lenses designed with three distinct focal zones. They are commonly used in eyeglasses to help people see far away, at intermediate distance, and up close. They are most often prescribed for presbyopia, the age-related reduction in near focusing ability. In some settings, &#x201C;trifocal&#x201D; can also describe certain intraocular lenses used during cataract surgery.</description></oembed>
