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Micro versus standard clear corneal incision phacoemulsification: visual outcome

Poster Details

First Author: V.Jain INDIA

Co Author(s):    S. Khokhar   A. Agarwal   M. Vanathi   J. Ram     

Abstract Details


Purpose: To compare the visual outcome of micro incision (2.2 mm) with standard (2.75 mm) corneal incision phacoemulsification.


Setting: All India Institute of Medical Sciences, New Delhi, India


Methods: In this prospective, randomized comparative study, patients with senile cataract and less than 1 diopter (D) of astigmatism were divided in two groups. Group 1 included patients undergoing phacoemulsification with 2.2 mm clear corneal incision and group 2 with 2.75 mm incision. The steep axis measured on keratometry was marked preoperatively. Phacoemulsification was performed through clear corneal incision on this steep axis. Assessment of visual acuity (distance and near), keratometry, keratometric cylinder, contrast sensitivity by functional acuity contrast test (FACT) and SIA was performed at day 1, 1 week, 1, 3 and 6 months.


Results: 50 eyes of 50 patients were included in the study (29 males). There were 25 patients in each group. The mean SIA (SIA), calculated by vector analysis method (Holladay, Cravy and Koch) using keratometry value, at the end of 6 months was 0.54±0.18D and 0.58±0.14D in group 1 and group 2, respectively (p = 0.27). No significant differences were found in the distance and near uncorrected visual acuity, mean keratometry, keratometric cylinder, contrast sensitivity and SIA at any follow-up visit between two groups.


Conclusion: In patients with less than 1 D astigmatism undergoing phacoemulsification, both micro incision (2.2 mm) and standard clear corneal incisions (2.75 mm) result in similar postoperative visual outcome in terms of SIA, keratometry and contrast sensitivity.

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