The prism cover test (PCT), is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye.[1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components.[1] Manifest is defined by the eye deviating constantly or intermittently, where-as latent is where the deviation is normally controlled but becomes present when the eyes are dissociated.[2] A PCT reveals the total deviation and cannot distinguish between latent and manifest strabismus as you are using an alternate cover test.
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