Trifocal lenses
Trifocals are eyeglasses with lenses that have three regions which correct for distance, intermediate (arm's length), and near vision. John Isaac Hawkins developed the trifocal lens in 1827. Trifocals are mostly used by people with advanced presbyopia who have been prescribed 2 diopters or more of reading addition. The intermediate addition is normally half the reading addition. So, for someone with a distance prescription of −4 diopters and a reading addition of +3, the reading portion of their trifocals would have a net power of −1, and the intermediate segment would be −2.5 diopters.
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Trifocal lenses
Trifocals are eyeglasses with lenses that have three regions which correct for distance, intermediate (arm's length), and near vision. John Isaac Hawkins developed the trifocal lens in 1827. Trifocals are mostly used by people with advanced presbyopia who have been prescribed 2 diopters or more of reading addition. The intermediate addition is normally half the reading addition. So, for someone with a distance prescription of −4 diopters and a reading addition of +3, the reading portion of their trifocals would have a net power of −1, and the intermediate segment would be −2.5 diopters.
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Les lents trifocals són lents ...... la lent trifocal intraocular.
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Trifocals are eyeglasses with ...... se to wear progressive lenses.
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العدسات ثلاثية البؤر (بالإنجلي ...... لاستخدام (progressive lenses).
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Les lents trifocals són lents ...... que podem trobar avui en dia.
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Trifocals are eyeglasses with ...... egment would be −2.5 diopters.
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العدسات ثلاثية البؤر (بالإنجلي ...... جزء المتوسط سيكون −2.5 ديوبتر.
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Lent trifocal
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Trifocal lenses
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عدسة ثلاثية البؤر
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