Prism bar | definition of prism bar by Medical dictionary
prism bar (prizm bahr)
A graduated series of prisms mounted on a frame and used in ocular diagnosis.
References in periodicals archive
And it certainly wasn't by pretending they had just stepped into Superman's icebound Fortress of Solitude when standing at the Prism Bar
Typically, a horizontal and vertical prism bar
are used simultaneously and held back-to-back in front of the patient's line of sight to measure this vision problem.
Fusional ranges can be measured using a prism bar
or phoropter head.