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The Four Prism Dioptre Reflex Test (also known as the 4 PRT, or 4 Prism Dioptre Baseout Test), is an objective, nondissociative test used to prove the alignment of both eyes (i.e. the presence of binocular single vision) by assessing motor fusion.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 regain bifoveal fixation meaning, they overcome that amount of power.

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