May 01, 2014
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LPI in temporal iris yields less linear dysphotopsia than in superior iris

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Laser peripheral iridotomy performed in the temporal iris resulted in less linear dysphotopsia than in the superior iris, according to a study.

The prospective, randomized clinical trial included 338 eyes of 169 patients with primary angle-closure glaucoma or suspected primary-angle closure glaucoma who underwent laser peripheral iridotomy (LPI) temporally in one eye and superiorly in the fellow eye.

Investigators evaluated the occurrence on new-onset linear dysphotopsia. They used a questionnaire to assess other visual disturbances preoperatively and 1 month postoperatively. Secondary outcome measures were eyelid position, laser settings and intraoperative complications.

Mean laser energy used, number of shots and total energy were similar in the temporal LPI and superior LPI groups.
Eighteen eyes (10.7%) in the superior surgery group and four eyes (2.4%) in the temporal surgery group showed signs of new-onset dysphotopsia. The difference was statistically significant (P = .002).

Linear dysphotopsia was reported in 11 eyes (6.5%) in the superior surgery group despite complete eyelid coverage of the iridotomy.

Subjective pain scores were 2.8 in the temporal LPI group and 2.1 in the superior LPI group. The between-group difference was statistically significant (P < .001).
Intraoperative hemorrhage rates were 8.9% in the temporal LPI group and 10.1% in the superior LPI group; the difference was insignificant.

Disclosure: The authors have no relevant financial disclosures.