Bifocal is a 7 letter English word. It's valid Scrabble word worth 14 points. It's valid Words with friends word worth 17 points.
You can make 180 anagrams from letters in bifocal (abcfilo).
An Americanism dating back to 1885-90; bi-1 + focal
His most direct contribution to medicine was the invention for his own use of bifocal eyeglasses.
Any other fish or mammal would have been just as likely as Anableps to begin the development of a bifocal eye.