Early Impact of Nd:YAG laser peripheral iridectomy on visual quality
Yang Zhang,Ailing Bian,Xiaoli Liu,Qi Zhou
Department of Ophthalmology, Peking Union Medical College Hospital, Peking Union Medical College,Eye Research Center of Chinese Academy of Medical Sciences, Beijing 100730, China
Objective: To evaluate the early impact of Nd:YAG laser peripheral iridectomy (LPI) on visual quality.Methods: This was a prospective self-controlled study in which patients with primary angle closure underwent LPI during March to June 2016 at Department of Ophthalmology, Peking Union Medical College Hospital were enrolled. An optical quality analysis system was used before and one week after LPI to assess the visual quality. The objective scatter index (OSI), Strehl ratio (SR), modulation transfer function (MTF) cut off, mean OSI , visual acuity (VA)100%, VA 20 ％ , and VA 9%, and accommodation values were measured.Differences in the measurements before and one week after LPI were compared by paired t-tests and Wilcoxon rank sum tests. Results: Forty-two patients (52 consecutive eyes, mean age: 63.5±8.4, age range 41 to 80 years)received LPI. There were no statistically significant differences in best corrected visual acuity or intraocular
pressure before and one week after LPI. VA100%, VA 20%, and VA 9% before LPI were 0.73±0.37, 0.49±0.25,and 0.29±0.13 respectively. At one week after LPI, they were 0.77±0.30, 0.54±0.26, 0.32±0.15 respectively,with no significant differences from the pre-LPI values. None of the differences in OSI, MTF cut off, SR,
mean OSI, and accommodation values before and one week after LPI were all not statistically significant.Conclusions: Nd:YAG did not have any impact on visual quality or accommodation. LPI was a safe and effective preventive therapeutic procedure for primary angle closure.
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