Bifocal: meaning, definitions and examples
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bifocal
[ หbaษชหfoสkษl ]
eyewear types
Bifocal lenses are optical lenses that contain two distinct optical powers. They are primarily used to correct presbyopia, a condition that affects the eye's ability to focus on nearby objects as people age. The top section of the lens is designated for distance vision, while the lower part is for near vision. This dual functionality allows wearers to see clearly at different distances without needing to switch between multiple pairs of glasses.
Synonyms
bi-vision, double vision, two-focus.
Examples of usage
- He bought bifocal glasses for reading and driving.
- After struggling to see both closely and far away, she decided to get bifocals.
- The doctor recommended bifocal lenses for his aging vision.
Translations
Translations of the word "bifocal" in other languages:
๐ต๐น bifocal
๐ฎ๐ณ เคฆเฅเคตเคฟเคฆเฅเคทเฅเคเคฟ
๐ฉ๐ช Bifokal
๐ฎ๐ฉ bifokal
๐บ๐ฆ ะฑััะพะบะฐะปัะฝะธะน
๐ต๐ฑ bifokalny
๐ฏ๐ต ไบ้็ฆ็นใฌใณใบ
๐ซ๐ท bifocal
๐ช๐ธ bifocal
๐น๐ท bifokal
๐ฐ๐ท ์ด์ค ์ด์
๐ธ๐ฆ ุซูุงุฆู ุงูุจุคุฑุฉ
๐จ๐ฟ bifokรกlnรญ
๐ธ๐ฐ bifokรกlny
๐จ๐ณ ๅ็ฆ็น
๐ธ๐ฎ bifokal
๐ฎ๐ธ bifokal
๐ฐ๐ฟ ะตะบั ัะพะบัััั
๐ฌ๐ช แแแคแแแแแฃแ แ
๐ฆ๐ฟ bifokal
๐ฒ๐ฝ bifocal
Etymology
The term 'bifocal' is derived from the combination of 'bi-', meaning two, and 'focal', related to focus. The concept of bifocal lenses is attributed to Benjamin Franklin in the 18th century. Franklin is said to have developed the first pair of bifocals by cutting two different lenses in half and combining them into one frame, allowing him to see both far and near without switching glasses. Since then, bifocal lenses have evolved, and modern advancements have led to the creation of progressive lenses that provide a smoother transition between different focal points. The use of bifocals has grown significantly with the aging population, as presbyopia affects nearly everyone after a certain age.