title: Bias of the cover test in the diagnosis of alternating tropia.
abstract: In the evaluation of patients with alternating tropia, all errors tends to falsely overclassify the fixation pattern as free alternation and underestimate monocular fixation. This bias is particularly undesirable in infants when the cover test is used because more direct measurements of visual acuity are not possible.
mesh_terms: D005403:Fixation, Ocular; D006801:Humans; D007223:Infant; D008722:Methods; D013285:Strabismus / Q000175:diagnosis*; D014792:Visual Acuity