Free Online Dictionary
|Wikipedia English The Free Encyclopedia||Download this dictionary|
Trifocals are eyeglasses where the lenses have 3 regions to correct for distance, intermediate (arm's length), and near vision. They 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.
|See more at Wikipedia.org...|
The following video provides you with the correct English pronunciation of the word "trifocals", to help you become a better English speaker.
© This article uses material from Wikipedia® and is licensed under the GNU Free Documentation License and under the Creative Commons Attribution-ShareAlike License
|Dizionario inglese-italiano 1.0.012||Download this dictionary|
|MHM Advanced English > Persian (v. 90)||Download this dictionary|
[.adj. & n]: داراى سه فاصله کانونى و مرکزى ، سه کانونى
|Babylon English-Turkish||Download this dictionary|
i. üç odaklı camı olan gözlük, üç odak uzunluğuna sahip gözlük merceği
|Babylon English English dictionary||Download this dictionary|
n. eyeglasses with trifocal lenses, eyeglasses having lenses with three focal lengths
| trifocals in English | trifocals in French | trifocals in Italian | trifocals in Spanish | trifocals in Dutch | trifocals in Portuguese | trifocals in German | trifocals in Russian | trifocals in Japanese | trifocals in Korean | trifocals in Turkish | trifocals in Hebrew | trifocals in Arabic | trifocals in Danish | trifocals in Norwegian | trifocals in Swedish | trifocals in Farsi
You think you have ethics... Take the survey NOW!