Influence of posterior corneal astigmatism on postoperative refractive astigmatism in pseudophakic eyes after cataract surgery

BMC Ophthalmology

Research Article

Takahiro Hiraoka¹  Yuta Ueno¹  Tetsuro Oshika¹  Maki Sano²  Hideo Itagaki³  Tomohiro Ogami⁴ 

[1] Department of Ophthalmology, Faculty of Medicine, University of Tsukuba, 2-1-1 Amakubo, 305-8576, Tsukuba, Ibaraki, Japan;Department of Ophthalmology, University of Tsukuba Hospital, 2-1-1 Amakubo, 305-8576, Tsukuba, Ibaraki, Japan;Hitachi General Hospital, 2-1-1 Jonancho, 317-0077, Hitachi, Ibaraki, Japan;Seinan Medical Center hospital, 2190 Sakaimachi, 306-0433, Sashimagun, Ibaraki, Japan;Hitachi General Hospital, 2-1-1 Jonancho, 317-0077, Hitachi, Ibaraki, Japan;Seinan Medical Center hospital, 2190 Sakaimachi, 306-0433, Sashimagun, Ibaraki, Japan;

关键词: Posterior astigmatism;    Cataract surgery;    Toric intraocular lens;   

DOI  :  10.1186/s12886-016-0391-1

 received in 2016-04-19, accepted in 2016-11-24,  发布年份 2016

来源: Springer

【 摘 要 】

BackgroundTo examine the influence of posterior corneal astigmatism on postoperative refractive astigmatism in pseudophakic eyes after cataract surgery.MethodsThe study enrolled 64 pseudophakic eyes of 50 patients (71.8 ± 9.9 years old, mean ± standard deviation) who had undergone phacoemulsification with non-toric IOL implantation. Refractive astigmatism was measured using an auto ref-keratometer with a 0.01- diopter (D) scale. Two types of corneal astigmatism were calculated using anterior segment optical coherence tomography; keratometric and total corneal astigmatism. Keratometric astigmatism was obtained based on anterior corneal curvature alone and total corneal astigmatism was calculated using both anterior and posterior corneal curvatures. The difference between refractive and corneal astigmatism was computed as the vector difference using 1) refractive and keratometric astigmatism and 2) refractive and total corneal astigmatism.ResultsThe mean refractive, keratometric, and total corneal astigmatism was 0.92 ± 0.48 D, 0.87 ± 0.44 D, and 0.94 ± 0.46 D, respectively. The difference between refractive and keratometric astigmatism (0.70 ± 0.40 D, mean vector of 0.30 D axis 164°) was significantly larger than the difference between refractive and total corneal astigmatism (0.63 ± 0.38 D, mean vector of 0.12 D axis 137°) (P = .019).ConclusionsThe difference between refractive and total corneal astigmatism, calculated using both anterior and posterior corneal curvatures, was significantly smaller than the difference between refractive and keratometric astigmatism using anterior corneal astigmatism alone, implying that the latter overestimates the true postoperative refractive astigmatism and can cause cylindrical inaccuracy after cataract surgery.

【 授权许可】

CC BY   
© The Author(s). 2016