title: Correlation of higher order aberrations and components of astigmatism in myopic refractive surgery candidates.
abstract: OBJECTIVE
  To evaluate the correlation between refractive, corneal, and residual astigmatism and higher order aberrations (HOA) in refractive surgery candidates.
  
  
  METHODS
  Three hundred and seventy-five eyes of 188 patients aged 28.2 ± 6.24 years with a predominance of females (62.7%) were enrolled in this study. Refraction, topography (Orbscan IIz, Bausch & Lomb, Rochester, NY, USA), and aberrometry (Zywave, Bausch & Lomb, Rochester, NY, USA) were performed to determine refractive and corneal astigmatism and HOA for all participants. Ocular residual astigmatism was calculated using vector analysis.
  
  
  RESULTS
  The mean spherical equivalent was -3.59 ± 1.95 D and the mean refractive astigmatism was -1.97 ± 1.3 D. The mean HOA was 0.38 ± 0.15 μm in all cases, which increased with spherical equivalent (p < 0.05). There was a positive significant correlation between both corneal and refractive astigmatism and HOA (p < 0.05), but there was no significant correlation between residual astigmatism and HOA (p = 0.122).
  
  
  CONCLUSIONS
  The results of the study showed significant correlations between corneal and refractive astigmatisms and HOA.
authors: Farabi Eye Hospital, Eye Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors: Mehrdad
authors: M
authors: Mohammadpour
authors: School of Allied Medical Sciences, Mazandaran University of Medical Sciences, Sari, Iran.
authors: Zahra
authors: Z
authors: Heidari
authors: Ophthalmic Research Center, Torfeh Medical Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Hossein
authors: H
authors: Mohammad-Rabei
authors: Department of Optometry, Iran University of Medical Science, Tehran, Iran.
authors: Ebrahim
authors: E
authors: Jafarzadehpur
authors: Farabi Eye Hospital, Eye Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors: Mahmoud
authors: M
authors: Jabbarvand
authors: Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran.
authors: Hassan
authors: H
authors: Hashemi
authors: Department of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Mehdi
authors: M
authors: Khabazkhoob
keywords: Corneal astigmatism; Higher order aberrations; Refractive astigmatism; Residual astigmatism; Zywave