<unk>  is a form of strabismus in which, compared to the correct positioning of the eyes, there is a torsion of one eye (or both) about the eye's visual axis. Consequently, the visual fields of the two eyes appear tilted relative to each other. The corresponding latent condition – a condition in which torsion occurs only in the absence of appropriate visual stimuli – is called cyclophoria.<unk>  is often associated with other disorders of strabism, can result in double vision, and can cause other symptoms, in particular head tilt. In some cases, subjective and objective cyclodeviation may result from surgery for oblique muscle disorders; if the visual system cannot compensate for it,<unk>  and rotational double vision (cyclodiplopia) may result. The role of<unk>  in vision disorders is not always correctly identified. In several cases of double vision, once the underlying<unk>  was identified, the condition was solved by surgical<unk>  correction. Conversely, artificially causing<unk>  in cats leads to reduced vision acuity, resulting in a defect similar to strabismic amblyopia.
Cyclotropia
Exotropia
Esotropia
Ocular dysmetria
Quadrantanopia
Heterotopia 
Pseudomyopia
Presbyopia