Editing Strabismus (section)

=== Latency ===
Strabismus can be manifest (''-tropia'') or latent (''-phoria'').  A manifest deviation, or heterotropia (which may be ''eso-'', ''exo-'', ''hyper-'', ''hypo-'', ''cyclotropia'' or a combination of these), is present while the person views a target binocularly, with no occlusion of either eye.  The person is unable to align the gaze of each eye to achieve fusion.  A latent deviation, or [[heterophoria]] (''eso-'', ''exo-'', ''hyper-'', ''hypo-'', ''cyclophoria'' or a combination of these), is only present after binocular vision has been interrupted, typically by covering one eye.  This type of person can typically maintain fusion despite the misalignment that occurs when the positioning system is relaxed.  Intermittent strabismus is a combination of both of these types, where the person can achieve fusion, but occasionally or frequently falters to the point of a manifest deviation.