The<unk>  is regarded as an essential examination in investigating strabismus. It is simple to undertake, does not require great amounts of skill by the examiner and is objective in nature. To ensure that the test is executed accurately and that the maximal amount of information is obtained, it is paramount that the appropriate fixation targets are used for near (approximately ), distance () and far distance (>) and also that a<unk>  consisting of a black ‘paddle’ is used. A translucent occluder paddle may also be used. This enables the examiner to see the eye's position behind the occluder. Many characteristics of a strabismus can be gained from performing the<unk> . Strabismus * The type of deviation: whether it be eso, exo, hyper, hypo or cyclo tropia. * The size of the deviation: slight, small, moderate or large * Speed to take up fixation: if the eye takes up fixation fast it means there is good vision in that eye * Accommodation on the deviation * Nystagmus * Dissociated vertical deviation (DVD) * Incomitance – deviation angle varies in each position of gaze Latent deviation * Type of deviation: esophoria, exophoria, hyperphoria, hypophoria, cyclophoria * Size of deviation * Rate of recovery that enables the person to achieve binocular single vision. It also says a lot about the strength of control<unk>  the deviation.
Cover test
Tensilon test
Stenger test
Rinne test
Tine test
Draize test
Reinsch test
Goldberg test