noun plural. eyeglasses whose lenses have two foci, allowing the wearer to see both far and nearby objects clearly. The lenses are partitioned horizontally, the upper and lower parts having different focal lengths.

noun. spectacles that have corrective lenses of two different powers; used by people who need both distance and reading glasses

noun. eyeglasses having two focal lengths, one for near vision and the other for far vision

"As for presbyopia, I'm on my second pair of what used to be called bifocals but are now called something else because they don't have a line across the lens -- continuous?"

bifocal  trifocals  

eyeglasses  glasses  specs  spectacles  

Polaroid glasses  blinkers  cheaters  colored glasses  contact lens