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- Trifocal_lenses abstract "Trifocals, patented in 1827 by John Isaac Hawkins, are eyeglasses with lenses that have three regions which correct for distance, intermediate (arm's length), and near vision. 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. Trifocal lenses are made in similar styles to bifocals, but with an additional segment for intermediate vision above the reading section. A common style is the 7×28 flat-top or D-shaped segment, 28 mm wide, with a 7 mm high intermediate segment. Larger intermediate segments are available, and are particularly useful for people who spend a lot of time using computers.Trifocals are becoming rarer as more people choose to wear progressive lenses.".
- Trifocal_lenses wikiPageID "734449".
- Trifocal_lenses wikiPageLength "1229".
- Trifocal_lenses wikiPageOutDegree "8".
- Trifocal_lenses wikiPageRevisionID "589107981".
- Trifocal_lenses wikiPageWikiLink Bifocals.
- Trifocal_lenses wikiPageWikiLink Category:Corrective_lenses.
- Trifocal_lenses wikiPageWikiLink Dioptre.
- Trifocal_lenses wikiPageWikiLink Glasses.
- Trifocal_lenses wikiPageWikiLink John_Isaac_Hawkins.
- Trifocal_lenses wikiPageWikiLink Lens_(optics).
- Trifocal_lenses wikiPageWikiLink Presbyopia.
- Trifocal_lenses wikiPageWikiLink Progressive_lens.
- Trifocal_lenses wikiPageWikiLinkText "Trifocal lenses".
- Trifocal_lenses wikiPageWikiLinkText "trifocal lenses".
- Trifocal_lenses wikiPageWikiLinkText "trifocal".
- Trifocal_lenses wikiPageUsesTemplate Template:Eye-stub.
- Trifocal_lenses wikiPageUsesTemplate Template:Redirect.
- Trifocal_lenses wikiPageUsesTemplate Template:Unreferenced.
- Trifocal_lenses subject Category:Corrective_lenses.
- Trifocal_lenses hypernym Eyeglasses.
- Trifocal_lenses type Redirect.
- Trifocal_lenses comment "Trifocals, patented in 1827 by John Isaac Hawkins, are eyeglasses with lenses that have three regions which correct for distance, intermediate (arm's length), and near vision. 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.".
- Trifocal_lenses label "Trifocal lenses".
- Trifocal_lenses sameAs Q7841511.
- Trifocal_lenses sameAs m.036sth.
- Trifocal_lenses sameAs Q7841511.
- Trifocal_lenses wasDerivedFrom Trifocal_lenses?oldid=589107981.
- Trifocal_lenses isPrimaryTopicOf Trifocal_lenses.