Which test uses prisms to center the corneal reflex?

The Krimsky test employs prisms to center the corneal reflex, which is critical in assessing strabismus or misalignment of the eyes. This test involves placing prisms in front of the eye to align the corneal reflex of the patient with the light source being used, allowing for an accurate measurement of the angle of deviation. The use of prisms helps in determining the degree of strabismus and can provide valuable information for treatment options.

On the other hand, the cover test is primarily used to detect ocular misalignment by observing the movement of the uncovered eye when the other eye is occluded. The Maddox rod test assesses heterophoria by using a cylindrical lens with an indicator line to measure the eye's alignment under different conditions. The Snellen chart is used for visual acuity assessment and does not involve the measurement of ocular alignment or reflex. Thus, it is the Krimsky test that specifically uses prisms for centering the corneal reflex, which is key in evaluating visual alignment disorders.