title: [Predictability of residual astigmatism after implantation of posterior chamber toric lenses].
abstract: The objective of the study was to examine the predictability of residual astigmatism after cataract surgery and implantation of the posterior chamber aspheric toric lens TECNIS® ZCT, ﻿﻿﻿Abott Medical Optic (Ettlingen, Deutschland).
  
  
  
  The retrospective study included a total of 88 patient eyes undergoing a cataract operation with a toric lens implantation between March 2014 and October 2015. The inclusion criteria were a regular astigmatism of at least 0.75 dpt. Posterior chamber toric lenses (model Tecnis ZCT) were exclusively implanted. Post-surgery check-ups were performed after 1 day, 1 month and 2 months. Main study outcome was best-corrected visual acuity (BCVA), spherical and astigmatic aberration and the difference between expected and actual residual astigmatism after cataract surgery.
  
  
  
  The median reduction of corneal astigmatism was from -2.50 dpt (±1.06 dpt) to -0.75 dpt (±0.51 dpt) (p ≤ 0.05). The median BCVA increased from 0.37 logMAR (±0.25 logMAR) before surgery to 0.09 logMAR (±0.10 logMAR) after surgery. The spherical equivalent was reduced from +3.50 dpt (±1.11 dpt) (presurgery) to -0.56 dpt (±0.51 dpt) (postsurgery) in hyperopic patients and from -2.44 dpt (±3.03 dpt) to -0.69 dpt (±0.81 dpt) in myopic patients. By using the power vector analysis no significant deviation from the expected target values was observed; however, the median discrepancy between the expected and actual residual astigmatism was -0.50 dpt despite a surgical orientation of the intraocular lens (IOL) within 5° of the desired axis. The IOL showed a median rotation of 3.00° (±4.46°).
  
  
  
  Implantation of the aspheric toric intraocular lens Tecnis ZCT is a predictable, effective and reproducible tool in cataract surgery to account for regular corneal astigmatis; however, despite an optimal surgical orientation of the toric IOL, a small and rarely a large discrepancy might occur between expected and actual residual astigmatism.
authors.affiliation: Hochschule für angewandte Naturwissenschaften, München, Deutschland. daniela-mies@web.de.|Augenklinik Herzog Carl Theodor, Nymphenburger Str. 43, 80335, München, Deutschland. daniela-mies@web.de.
authors.forename: D
authors.initials: D
authors.lastname: Mies
authors.affiliation: Augenklinik Herzog Carl Theodor, Nymphenburger Str. 43, 80335, München, Deutschland.
authors.forename: T
authors.initials: T
authors.lastname: Klink
authors.affiliation: Hochschule für angewandte Naturwissenschaften, München, Deutschland.
authors.forename: W
authors.initials: W
authors.lastname: Eisenbarth
authors.affiliation: Augenklinik Herzog Carl Theodor, Nymphenburger Str. 43, 80335, München, Deutschland.
authors.forename: L M
authors.initials: LM
authors.lastname: Meyer
mesh_terms: D001251:Astigmatism; D002386:Cataract; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D018918:Phacoemulsification; D011446:Prospective Studies; D012029:Refraction, Ocular; D012189:Retrospective Studies; D014792:Visual Acuity
keywords: Astigmatism; Cataract surgery; Refractive surgery; Residual astigmatism; Tecnis® ZCT toric intraocular lenses