cycloduction

(redirected from cyclotorsion)

cy·clo·duc·tion

(sī'klō-dŭk'shŭn),
Rotation of the eye around its visual axis.
Synonym(s): circumduction (2) [TA], cyclotorsion
[cyclo- + L. duco, pp. ductus, to draw]
Farlex Partner Medical Dictionary © Farlex 2012

cy·clo·duc·tion

(sī'klō-dŭk'shŭn)
Rotation of the eye around its visual axis.
Synonym(s): circumduction (2) .
[cyclo- + L. duco, pp. ductus, to draw]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

cycloduction 

Rotation of an eye around its anteroposterior axis. Syn. cyclorotation; cyclotorsion. See torsion.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
A comparison of three different corneal marking methods used to determine cyclotorsion in the horizontal meridian.
Sitting posture was preferred to avoid cyclotorsion. Slitlamp was used and a thin beam of slit was placed on the cornea to mark at 3 and 9 O'clock position.
It also covers surgery planning and VisuMax software: patient and laser preparation; docking, centration, and cyclotorsion; femtosecond laser cutting; energy and spot spacing settings; surgical instruments; lenticule separation and extraction; non-routine situations during lenticule interface separation; postoperative complications and management; retreatments; therapeutic refractive surgery; adaptations for US SMILE parameters; a recommended standard treatment protocol for SMILE; treatment planning; and assisting nurse responsibilities.
Plaza-Puche, "Laser-assisted in situ keratomileusis in high mixed astigmatism with optimized, fast-repetition and cyclotorsion control excimer laser," American Journal of Ophthalmology, vol.
Residual refraction also occurs, for example, when an eye, corrected in the spectacle plane, is unstable owing to cyclotorsion [4].
Dr Maria's research, titled 'Cyclotorsion registration before flap cut and after flap lift,' received a honourable mention by the ASCRS organisation among 358 scientific posters, 60 of them in the categA[degrees] ory of Keratorefractive surgery.
While cycloversion concerns conjugate torsional movements of the eyes provoked via vestibular stimulation, cyclovergence refers to counterrotations between the two eyes whose aim is to compensate for cyclotorsion during ocular movements in order to maintain fusion.
Cyclotorsion of the eye (rotation) is very common when patients lie down and as a result it is important for surgeons to have accurate ways of marking the eye so that the correct axis of astigmatism is targeted surgically when the patient invariably is lying down for the procedure.
Wavefront-guided LASIK is designed for compensating the induction of HOAs but as we have mentioned above, there is no iris registration in SMILE that compensates for pupillary cyclotorsion and offset to provide good centration.
Of the eight patients with horizontal strabismus, five and three had exodeviation and esodeviation, respectively (Table 2); however, two patients had no definite deviation determined by alternate cover and cyclotorsion tests.
Particular care was taken to ensure that the iris recognition data would allow for 4-dimensional eye tracking during the procedure, since it is quite common for intra-procedural cyclotorsion of more than 3[degrees] to occur.
The Technolas Perfect Vision laser was the first to introduce true iris recognition technology, being capable of recognizing every eye on the planet, and combine it with real-time rotational eye tracking in order to respond to any eye movement, including cyclotorsion. With each such advance in technology, there has been a simultaneous rise in quality of outcomes experienced by patients with astigmatism (Figure 5).