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Wavefront aberrations after femtosecond laser-assisted cataract surgery
Session Title: Femto-cataract
Session Date/Time: Monday 07/10/2013 | 08:00-10:00
Paper Time: 08:12
Venue: Forum (Ground Floor)
First Author: : S.Chee SINGAPORE
Co Author(s): : Y. Yang
To evaluate the wavefront aberrations after femtosecond laser assisted cataract surgery (FLACS) in an ophthalmic institution in Singapore
Singapore National Eye Centre
Case-control study. A study was conducted on 60 eyes that had undergone FLACS and had their ocular aberrations measured at 1 month. The Victus (Bausch+Lomb/Technolas PerfectVision, Munich, Germany) was used to perform capsulotomies targeting 5.0 mm and nucleofractis (4 to 8 radial cuts). Only eyes implanted with a monofocal intraocular lens and complete data were included. Eyes with pre-existing corneal pathology and incomplete data were excluded. The higher order aberrations (HOAs) were measured using a wavefront analyser. A random sample of 60 eyes with cataract surgery done the previous year with a similar lens implant but without the femtosecond laser formed the control group. The ocular, corneal and internal HOAs were compared between the study groups.
There were 54 FLACS eyes and 56 controls that were included. Mean age of the patients and controls were 67 years and 66 years respectively. The mean postoperative unaided visual acuity was significantly better in the FLACS group (LogMAR 0.089±0.11) than in the control group (LogMAR 0.141±0.13) at 1 month follow up (Independent t test, P<0.05). There was no significant difference in the mean absolute refractive error between the two groups. The mean ocular total, third and fourth-order HOAs for the FLACS and control group were 0.154±0.046µm, 0.132±0.049µm, 0.070±0.035µm, 0.160±0.063µm, 0.144±0.055µm and 0.065±0.041µm. The corneal total, third and fourth-order HOAs for the FLACS and control group were 0.154±0.043µm, 0.130±0.050µm, 0.074±0.030µm, 0.175±0.065µm, 0.151±0.061µm and 0.084±0.03µm. The internal total, third and fourth-order HOAs for the FLACS and control groups were 0.103±0.040µm, 0.079±0.041µm, 0.060±0.025µm, 0.118±0.056µm, 0.094±0.049µm and 0.066±0.038µm. There was no statistical difference in the ocular, corneal and internal HOAs between the cases and controls.
Eyes treated with femtosecond laser had significantly better unaided visual acuity than those operated by manual methods but this could not be explained by a reduced mean refractive error nor HOAs.