This article is more than 5 years old. Information may no longer be current.
LPI in temporal iris yields less linear dysphotopsia than in superior iris
Laser peripheral iridotomy performed in the temporal iris resulted in less linear dysphotopsia than in the superior iris, according to a study.
“This is supported both by theoretical optics and the results of this clinical trial. It is likely that nasal placement would result in similar findings as temporal placement,” the study authors said.
The prospective, randomized clinical trial included 338 eyes of 169 patients with primary angle closure glaucoma (PACG) or suspected PACG who underwent laser peripheral iridotomy (LPI) temporally in one eye and superiorly in the fellow eye.
Investigators evaluated occurrence on new-onset linear dysphotopsia. They used a questionnaire to assess other visual disturbances preoperatively and 1 month postoperatively. Secondary outcome measures were eye lid 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 in the superior surgery group (6.5%) 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 study authors report no relevant financial disclosures.