Final answer:
To decide whether phoria is decompensated, tests such as the Cover Test, Maddox Rod Test, and Von Graefe Test can be used.
Step-by-step explanation:
To decide whether phoria is decompensated, several tests can be used. One commonly used test is the Cover Test, where the patient is asked to focus on a distant object and then alternate their gaze between two objects at near distance. Another test is the Maddox Rod Test, in which the patient is asked to view a series of vertical lines through a special lens. The position of the lines seen by each eye helps determine the presence and magnitude of phoria.
Additionally, the Von Graefe Test can be performed where the degree of ocular misalignment is measured by the observer's estimation of the amount of movement required to bring the two images together.