Which test for strabismus uses the corneal reflex and does not involve prisms?

The Hirschberg Test is the correct answer because it assesses the alignment of the eyes by observing the position of the corneal light reflex. When a light is directed at the patient's eyes, the reflection on the corneas should ideally be symmetrically located in relation to the pupils. If there is a misalignment, the light reflex will appear off-center, indicating strabismus. This test does not involve prisms; it purely relies on the natural reflex of the light reflecting off the cornea.

The other tests listed utilize prisms or different methodologies. The Krimsky Test, for instance, does involve the use of prisms to determine the degree of strabismus by measuring the degree of deviation based on how much prism needs to be placed to align the reflexes. The Cover Test looks for manifest strabismus by covering one eye and observing the uncovered eye's movement, but it does not utilize the corneal reflex directly. The Prism Test explicitly involves the application of prisms to quantify the angle of deviation. Thus, the unique feature of the Hirschberg Test is its simple reliance on the corneal reflex without the necessity of prisms to determine eye alignment.