different between trifocal vs trifocals
trifocal
English
Etymology
tri- +? focal
Adjective
trifocal (not comparable)
- (optics) Of or pertaining to corrective lenses that have three different powers per eye.
Related terms
- bifocal
- trifocals
trifocal From the web:
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trifocals
English
Etymology
From tri- + focal (see focus). Coined by John Isaac Hawkins, their inventor, in 1826.
Noun
trifocals pl (plural only)
- (optics) Spectacles with corrective lenses that have three different powers per eye.
Related terms
- bifocals
- trifocal
Translations
trifocals From the web:
- what are trifocals used for
- what do bifocals look like
- what do bifocals do
- what does trifocals
- what are trifocals bifocals
- what are trifocals for
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