April 2008

 

CATARACT/ IOL

 

Combo surgery induces less astigmatism than individual procedures


   

A recent study found that a combined phacoemulsification and pars plana vitrectomy procedure does not induce significant astigmatic change.

The research team, including Can Y.F. Yuen, F.R.C.S., Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, studied the surgically induced astigmatism (SIA) in combined phacoemulsification and vitrectomy and compared those results with that when either procedure is performed alone. The study was published in the March issue of Eye.

The study was a prospective, comparative, interventional trial comprising of 60 eyes of 60 consecutive patients with cataract and/or vitreo-retinal pathology. The researchers equally divided the patients into three groups based on the type of procedure: Group A, which only had phacoemulsification using a 3.0 to 3.2 mm wide unsutured sclero-corneal tunnel incision at 1.0 mm post-limbus at 10 o’clock; Group B, which only had par plana vitrectomy using three sclerotomies of 3.5 mm post-limbus at 2, 8, and 10 o’clock (right eye) or at 2, 4, and 10 o’clock (left eye) positions; and Group C, which had the combined phacoemulsification and pars plana vitrectomy procedure.

The main outcome measures were the amplitude (K-induced) and the axis of SIA calculated by rectangular coordinate method using the Holladay-Cravy-Koch formula.

Dr. Yuen reported that the mean K-induced amplitudes were 0.19 ± 0.14 D, 0.17 ± 0.11 D, and 0.23 ± 0.19 D for groups A, B, and C, respectively. The range of K-induced amplitudes for the entire cohort was 0.00 to 0.77 D.

There were not any overall statistically significant differences in the pre- and post-op topographic astigmatism amplitudes and the K-induced between groups A, B, and C (all P>0.05). The researchers did notice minor shifts in the axes of SIA, but Dr. Yuen reported that they were doubtful that they were of clinical significance.

Therefore, the researchers concluded that combined phacoemulsification and pars plana vitrectomy does not induce significant astigmatic, and its amount is similar to that when either procedure is performed alone.

Reported by: EyeWorld News Service

Combo surgery induces less astigmatism than individual procedures Combo surgery induces less astigmatism than individual procedures
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