Double vision (diplopia) is the simultaneous visualization of two images of the same object. Double vision occurs with violations of refraction, accommodation and convergence, neurological diseases, intoxication and injuries. Methods for diagnosing diplopia include visometry, computerized autorefractometry, biomicroscopy, ophthalmoscopy, MRI, radiography, laboratory tests, and pharmacological tests. For immediate elimination of a diplopia occlusion of one eye is shown. Etiotropic treatment is determined by the underlying disease.