Taank Priya, Shyamsunder K, Vichare Nitin, Pannu Anju, Pushkar Kumar, Bose Rupali, Khurana Rolli
Professor (Ophthalmology), Command Hospital (Southern Command), Pune, India.
Commandant, Military Hospital Roorkee, Uttarakhand, India.
Med J Armed Forces India. 2024 Sep-Oct;80(5):505-508. doi: 10.1016/j.mjafi.2022.07.005. Epub 2022 Sep 29.
This study aims at evaluating the validity profile of Titmus vision screener V4 for gauging visual acuity and colour perception as a screening tool.
Eleven hundred young adults attending eye OPD at a tertiary care center were included in the study. All individuals underwent distance visual acuity (DVA) measurement with Snellen chart and Titmus vision screener V4, at 6 m on the same day. Later, these individuals underwent colour vision testing with Ishihara pseudo isochromatic plates and Titmus vision screener V4.
The age distribution ranged from 19 to 53 years with mean age as 26.6 years. Males (87.4%) were more as compared to females. Mean DVA measured by Snellen's chart and Titmus vision screener V4 were 0.088 ± 0.15 and 0.110 ± 0.17, respectively (p = 0.000). Mean difference between DVA by Snellen's chart and Titmus screener V4 was -0.021 ± 0.82 with 95% CI (-0.026 to -0.016). For measuring visual acuity, Titmus vision screener V4 showed a sensitivity of 99.5% and specificity of 90.6%. Negative predictive value and positive predictive value were 99.6% and 85.6%, respectively. For diagnosing colour perception, the Titmus vision screener V4 showed a sensitivity of 100% and specificity of 99.8%. The negative predictive value and positive predictive value were 100% and 88.8% respectively. Area under the curve of receiver operating characteristic (ROC) curve was 0.960 with 95%CI (0.949-0.972).
Our study supports use of Titmus vision screener V4 as an excellent screening tool for measurement of visual acuity as well as colour perception.
本研究旨在评估Titmus视觉筛查仪V4作为一种筛查工具在测量视力和色觉方面的效度概况。
本研究纳入了1100名在三级医疗中心眼科门诊就诊的年轻人。所有个体在同一天于6米处使用Snellen视力表和Titmus视觉筛查仪V4进行远距离视力（DVA）测量。之后，这些个体使用石原氏假同色图和Titmus视觉筛查仪V4进行色觉测试。
年龄分布为19至53岁，平均年龄为26.6岁。男性（87.4%）多于女性。通过Snellen视力表和Titmus视觉筛查仪V4测量的平均DVA分别为0.088±0.15和0.110±0.17（p = 0.000）。Snellen视力表和Titmus筛查仪V4测量的DVA之间的平均差异为-0.021±0.82，95%置信区间为（-0.026至-0.016）。对于测量视力，Titmus视觉筛查仪V4的灵敏度为99.5%，特异性为90.6%。阴性预测值和阳性预测值分别为99.6%和85.6%。对于诊断色觉，Titmus视觉筛查仪V4的灵敏度为100%，特异性为99.8%。阴性预测值和阳性预测值分别为100%和88.8%。受试者操作特征（ROC）曲线下面积为0.960，95%置信区间为（0.949 - 0.972）。
我们的研究支持将Titmus视觉筛查仪V4用作测量视力和色觉的优秀筛查工具。
