A<unk>  or<unk> -uncover<unk>  is an objective determination of the presence and amount of ocular deviation. It is typically performed by orthoptists, ophthalmologists and optometrists during eye examinations. The two primary types of<unk> s are: * the alternating<unk>  * the unilateral<unk>  (or the<unk> -uncover<unk> . The<unk>  involves having the patient focusing on both a distance as well as near object at different times during the examination. A<unk>  is placed<unk>  an eye for a short moment then removed while observing both eyes for movement. The misaligned eye will deviate inwards or outwards. The process is repeated on both eyes and then with the child focusing on a distant object. The<unk>  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. A phoria (or latent deviation) only appears when binocular viewing is broken and the two eyes are no longer looking at the same object. The unilateral<unk>  is performed by having the patient focus on an object then<unk> ing the fixating eye and observing the movement of the other eye. If the eye was exotropic,<unk> ing the fixating eye will cause an inwards movement; and esotropic if<unk> ing the fixating eye will cause an outwards movement. The alternating<unk> , or cross<unk>  is used to detect total deviation (tropia + phoria).
Cover test
Tensilon test
Stenger test
Rinne test
Tine test
Draize test
Reinsch test
Goldberg test