trifocal
/ˈtraɪˌfoʊkəl/
adjective
- Having three focal points or three distinct areas of focus, especially referring to eyeglass lenses that correct for distance, intermediate, and near vision.
- My grandmother switched to trifocal lenses so she could see clearly at all distances.
- The optician recommended trifocal glasses for people who need help with computer work and reading.
- Trifocal contact lenses are less common than bifocal ones but are available for certain prescriptions.