prism cover test

prism cov·er test

measurement of the deviation in strabismus by the alternate cover test combined with neutralization for the deviation using prisms.
References in periodicals archive ?
Evaluation of muscle balance revealed an intermittent exotropia of 25 prism diopters, which was the same for distance (6 m) and near (1/3 m) in the alternate prism cover test.
c) Measure the angle of the deviation with prism cover test