Application of MP-3 microperimetry in Leber hereditary optic neuropathy
Objective To observe Leber's hereditary optic neuropathy(LHON)microperimetry features,discuss its significance in diagnosis and treatment of LHON assessment.Methods A retrospective clinical study.A total of 13 LHON patients(25 eyes)diagnosed in Department of Ophthalmology of the First Affiliated Hospital of Army Medical University from May 2015 to May 2020(disease group)were included in the study,including 9 males(18 eyes)and 4 females(7 eyes),and beginning with the age of 15.0(10.0,57.0).Ten healthy volunteers(19 eyes)were selected as the normal group,including 7 males(13 eyes)and 3 females(6 eyes),aged 22.0(6.0,46.0)years at the first diagnosis.According to the course is divided into:asymptomatic group(carriers),subacute(＜6 months),the dynamic group(6-12 months),chronic group(＞12 months).There were 7,6,5 and 7 eyes,respectively.All eyes underwent best corrected visual acuity(BCVA)and microperimetry.BCVA test was performed using the international standard visual acuity chart,which was statistically converted to the logarithm of the minimum Angle of resolution(logMAR)visual acuity.MP-3 microperimetry was used to perform microperimetry,and the mean sensitivity(MS)values of five regions were recorded:center,superior,temporal,inferior,and nasal.Mann-Whitney U test was used for comparison between two groups,and Kruskal-Wallis H test was used for comparison between multiple groups.Results Compared with the normal group,MS in the center,superior,temporal,inferior and nasal of the diseased group decreased,and the differences were statistically significant(Z=-5.629,-4.906,-5.630,-5.631,-5.227;P＜0.05).There were significant differences in different regions of MS between different course groups(H=12.296,11.583,10.110,12.994,8.663;P＜0.05).There were significant differences in logMAR BCVA and central MS between asymptomatic group and subacute group(P=0.040,0.007).There were significant differences in temporal,inferior and superior MS between subacute group and dynamic group(P=0.026,0.017,0.018).Dynamic and chronic group,MS above the difference was statistically significant(P=0.031).Idebenone treatment significantly improved visual field defects in 4 of 23 eyes.Conclusions In the early stage of LHON,the central visual field defect gradually progresses to the temporal,inferior and superior areas,and the temporal and inferior areas are more severe.Visual field defects reached a stable level at 6-12 months.MP-3 can assist in early diagnosis of LHON,and provide reliable basis for efficacy evaluation.
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