Cyclotropia

For the similar condition but where the eyes deviate inward, see Esotropia. For the similar condition but where the eyes deviate outward, see Exotropia.
Cyclotropia
SpecialtyOphthalmology Edit this on Wikidata

Cyclotropia 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.

Cyclotropia is often associated with other disorders of strabism, can result in double vision, and can cause other symptoms, in particular head tilt.[1]

In some cases, subjective and objective cyclodeviation may result from surgery for oblique muscle disorders; if the visual system cannot compensate for it, cyclotropia and rotational double vision (cyclodiplopia) may result.[2][3] The role of cyclotropia in vision disorders is not always correctly identified. In several cases of double vision, once the underlying cyclotropia was identified, the condition was solved by surgical cyclotropia correction.[4]

Conversely, artificially causing cyclotropia in cats leads to reduced vision acuity, resulting in a defect similar to strabismic amblyopia.[5]

  1. ^ Michael C. Brodsky (1 January 2010). Pediatric Neuro-Ophthalmology. Springer. p. 445. ISBN 978-0-387-69069-8. Retrieved 10 July 2013.
  2. ^ See section "Discussion" in: Pradeep Sharma; S. Thanikachalam; Sachin Kedar; Rahul Bhola (January–February 2008). "Evaluation of subjective and objective cyclodeviation following oblique muscle weakening procedures". Indian Journal of Ophthalmology. 56 (1): 39–43. doi:10.4103/0301-4738.37594. PMC 2636065. PMID 18158402. PMC 2636065.
  3. ^ H. D. Schworm; S. Eithoff; M. Schaumberger; K. P. Boergen (February 1997). "Investigations on subjective and objective cyclorotatory changes after inferior oblique muscle recession". Investigative Ophthalmology & Visual Science. Vol. 38, no. 2. pp. 405–412.
  4. ^ Burton J. Kushner (1992). "Unexpected Cyclotropia Simulating Disruption of Fusion". Archives of Ophthalmology. 110 (10): 1415–1418. doi:10.1001/archopht.1992.01080220077025. PMID 1417541.
  5. ^ Brian Timney; Carol K. Peck (November 1981). "Visual acuity in cats following surgically induced cyclotropia". Behavioural Brain Research. 3 (3): 289–302. doi:10.1016/0166-4328(81)90001-2. PMID 7306384. S2CID 4054627.