Four prism dioptre reflex test information

Four prism dioptre reflex test
Four prism dioptre reflex test
Purpose	assess alignment of both eyes

The Four Prism Dioptre Reflex Test (also known as the 4 PRT, or 4 Prism Dioptre Base-out Test) is an objective, non-dissociative test used to prove the alignment of both eyes (i.e. the presence of binocular single vision) by assessing motor fusion.^[1] Through the use of a 4 dioptre base out prism, diplopia is induced which is the driving force for the eyes to change fixation and therefore re-gain bifoveal fixation meaning, they overcome that amount of power.

^ Frantz, K. A., Cotter, S. A., Wick, B. (1992). Re-evaluation of the four prism dioptre base-out test. Optometry and Vision Science, 69(10), pp. 777-786. ISSN 1040-5488

[:0-1] Frantz, K. A., Cotter, S. A., Wick, B. (1992). Re-evaluation of the four prism dioptre base-out test. Optometry and Vision Science, 69(10), pp. 777-786. ISSN 1040-5488