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Year : 2017  |  Volume : 18  |  Issue : 3  |  Page : 143-148

Results of pupil dilatation using Oasis ring in eyes with narrow pupil during phacoemulsification

Ophthalmology Department, Tanta University Hospital, Tanta, Egypt

Correspondence Address:
Ahmed M Ghoneim
Ophthalmology Department, Tanta University Hospital, 71 El-Bahr St, PO Box 4111, Tanta, Gharbia Governorate
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/DJO.DJO_15_17

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Purpose To compare the results using Oasis ring for mechanical dilatation of the pupil during phacoemulsification in cases of narrow pupil with nonmechanical dilatation. Patients and methods This study included 80 eyes of 67 patients with cataract with narrow pupil. They were divided into two groups, each including 40 eyes. In one group, Oasis ring was used to achieve adequate pupillary dilatation, whereas in the other group, nonmechanical device methods such as bimanual stretching with partial sphincterotomies were used. Both groups were compared regarding achieved pupil size, additional time for dilatation, intraoperative difficulties, and postoperative pupil characters at 1-month follow-up. Results The mean pupil size was 6.00±0.00 mm in the Oasis ring group, whereas it was 4.26±0.48 mm in the nonmechanical device dilatation group, with statistically significant difference. Additional intraoperative time needed for pupil dilatation was significantly longer in Oasis ring group where it ranged from 83 to 117 s, whereas in the nonmechanical device dilatation group, it ranged from 48 to 76 s. There was more liability for intraoperative difficulties as iris prolapse, minimal bleeding, and iris trauma in the nonmechanical device dilatation group. Postoperative pupil characters after 1 month were rounded, central, and reactive in the Oasis ring group with oval-shaped pupil found only in one (2.5%) eye and minute tears in two (5%) eyes, whereas oval pupil was found in seven (17.5%) eyes and minute tears in five (12.5%) eyes in the nonmechanical device dilatation group. Statistically significant differences were found between the two studied groups. Conclusion Pupil dilatation with Oasis ring increases the intraoperative additional time for pupil dilatation, but it provides stable and sufficiently dilated pupil, with less liability for intraoperative complications when compared with non-mechanical device dilatation methods.

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