the cover test is used to assess for
The lazy eye will deviate inwards or outwards. The process is repeated on both eyes and then with the child focusing on a distant object. The cover test is used to determine both the type of ocular deviation and measure the amount of deviation. The two primary types of ocular deviations are the tropia and the phoria. A tropia is a misalignment of the two eyes when a patient is looking with both eyes uncovered.