Analysis of Ocular Cyclotorsion in Lying Position after Peribulbar Block

Abstract Background: Cyclotorsions are movements of cyclotorsion of the eyes. The cyclotorsion of the human eye occurs with movement of the head and body, changing the original position of the corneal axis. A significant different range of cyclotorsion between a lie and a supine position was previously reported as varying from 2 to 7 degrees. Aim of Study: The aim of this prospective study is to determine the amount of ocular cyclotorsion in supine position after peribulbar block, to avoid misalignment of the toric IOL which negates the desired effect of correcting astigmatism. Patients and Methods: A prospective observational rand-omized cross sectional study included a total of 50 eyes of 50 patients undergoing cataract surgery under peribulbar anaesthesia in El-Durrah Specialized Eye Centre, in the period from March 2018 to September 2018. Results: In this prospective series of 50 consecutive cases we observed that: The mean of cyclotorsion in the study after peribulbar block: Was (5.20±1.85 degrees), which was statis-tically significant greater than 0 degrees. Incyclotorsion appeared in 31 eyes (62%) and the mean of rotation was 5.77 degrees. Excyclotorsion ocurred in 16 eyes (32%) and the mean was 5.06 degrees. There were no cyclotorsion in 3 eyes. Cyclotorsion (1-5) degrees occurred in 27 eyes (48%). Cyclo-torsion more than 5 degrees occurred in 23 eyes (46%). Conclusion: Cyclotorsion represents another potential source of residual refractive errors that subsequently will lead to a reduced visual quality post-operatively. Therefore should be carefully taken into account in the pre-operative analyses.