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PRE005 Cover-uncover test at distance

Pre-refraction procedures • 31s

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    The cover test at near is used to elicit the presence of a heterotropia, heterophoria, orthotropia or orthophoria for near fixation targets.

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    Measuring eye deviation using the alternating cover test and prism bar. One or other eye is always covered during the test. To elicit the presence or absence of a heterophoria along with type of deviation (eso-, exo-, hyper- and cyclophoria), effect of refractive correction, accommodation and CHP...

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