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Impact of wound size and ocular structure on surgically-induced astigmatism after cataract surgery
Session Title: Corneal Incisions and preloaded IOLs
Session Date/Time: Sunday 06/10/2013 | 08:00-09:30
Paper Time: 08:18
Venue: Elicium 2 (First Floor)
First Author: : S.Chang TAIWAN
Co Author(s): : Y. Chen Y. Shau
To explore factors contributing to the following phacoemulsification
Far Eastern Memorial Hospital, Ban-Chiao, New Taipei City, Taiwan
This retrospective study incluided 842 eyes following 2.2mm (cartridge D, n=248), 2.75mm (cartridge C, n=357; cartridge B, n=116), and 3.2mm (folding forceps, n=121) sized superior limbal incision phacoemulsification. Intraocular pressure (IOP) was measured by Topcon CT80 pneumotonometer and corneal curvatures were measured by Topcon KR 8900 auto-refractor for all eyes. Preoperative axial length (AxL) and anterior chamber depth (ACD) were measured with Zeiss IOL Master in 2.2mm (cartridge D) and 2.75mm (cartridge C) groups. Postoperative corneal curvatures and IOP were measured at 1 day, 1 week, 1 month, and 3 months following surgery. Surgically induced astigmatism (SIA) was calculated using Alpins method. Difference in SIA between various wound sizes was explored. Correlations between preoperative astigmatism, corneal curvatures, ACD, AxL, IOP, age and SIA were analyzed for various wound sizes.
Smaller SIA were found in 2.2 mm than in 2.75mm and 3.2 mm groups. The SIA and IOP stabilized earlier in 2.2 mm group than in 2.75 mm groups. In addition to wound size, higher preoperative corneal astigmatism, older age, shallower ACD contributed to larger SIA for 2.2mm+MIIID and 2.75mm+MIIC groups. However, shorter AxL and lower IOP induced larger SIA in 2.75mm group, but not in 2.2 mm group.
Decreasing limbal wound size and considering factors other than corneal astigmatism in predicting SIA could contribute to optimize refractive lens surgery.