A fancy term for glasses that feature corrective lenses. Spectacles help those who have trouble seeing objects close up or at a distance. Bifocals and trifocals are types of spectacles containing lenses designed with multiple focus zones. Bifocals have two focal ranges. Trifocals have three. Multi-focused eyewear may feature a single lens with sections cut for certain focal ranges, or more mechanical varieties feature multiple lenses that can pivot into position to provide multiple levels of focus.

See also

• eyewear
• contacts
• glasses
• pince-nez
• spectacles