noun
- eyeglasses with lenses that have three different focal lengths for seeing at different distances (near, intermediate, and far)
Usage: usually plural
Examples
- My grandfather needs trifocals to read, use his computer, and drive safely.
- The optometrist recommended trifocals for patients who work extensively on computers.
- She struggled to adjust to her new trifocals at first.
- Trifocals have three distinct zones for different viewing distances.
- Many people find trifocals more convenient than switching between multiple pairs of glasses.
- The top section of his trifocals is for distance vision while driving.