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KMID : 1159320210230030237
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Korean Journal of Vision Science
2021 Volume.23 No. 3 p.237 ~ p.245
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Binocular Visual Function in Patients with Normal Tension Glaucoma
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Jang Jung-Un
Choi Joo-Hyung
Choy Yoon-Jung
Lee Koon-Ja
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Abstract
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Purpose : This study aims to describe the binocular visual function alterations in patients with normal tension glaucoma (NTG).
Methods : Of the patients who went to the ophthalmologist and were diagnosed, a total of 67 subjects of which 41 were classified as NTG, 26 non-glaucoma patients (control group) were participated. Standard visual field test, intra ocular pressure (IOP) measurement and retinal nerve fiber layer (RNFL) obsevation were performed. Also examined with binocular tests consisting of the measurement of phoria angles, near point of convergence (NPC), stereo acuity according to Titmus and TNO stereo tests. All measurements among groups were statistically compared with the SPSS 22.0 and ROC curves were plotted to describe the screening ability of binocular and stereopsis values.
Results : NTG subjects showed decreased RNFL and visual field index. In far and near vision, NTG subjects were worse compared to in the control group except for fusional reserve. In Titmus test, NTG subjects exhibited stereo acuity of 102.36±14.40" whereas control group exhibited 44.61±1.85". In TNO test showed 231.97±30.96" for the NTG and 89.42±12.02" for the control group. The area under ROC for Titmus and TNO stereo test were 0.797 and 0.807.
The sensitivity, specificity of Titmus stereo test were 0.737 and 0.731, and those of TNO stereo test were 0.500 and 0.115.
Conclusion : Titmus stereo acuity could be used as the gold standard for screening tools for NTG.
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KEYWORD
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Binocular visual function, Normal tension glaucoma, Stereo acuity, Titmus stereo test
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