To assess whether results obtained by Titmus V4 occupational landoltmodel are valid compared to the results obtained by traditional vision tests.
Specific tests were performed by Titmus for distanceand near visual acuity, stereoacuity and color perception while traditional vision testswere performed by using 20-feet and 14-inch number snellen charts for visual acuity,Stereofly wirt dot for stereoacuity and Ishihara 38-plates for color perception.The resultsobtained through Titmus and those obtained through traditional vision tests werecompared. Descriptive statistics, sensitivity, specificity and kappa statistics werecalculated for data analysis.
Visual performance of 220 participants mean aged 34 ± 8.6 years was obtained.Sensitivity of Titmus for distance visual acuity, near visual acuity, color perception andstereoacuity were 95.8%, 90.9%, 100% and 64.3% respectively. Specificity of Titmus fordistance visual acuity, near visual acuity, color perception and stereoacuity were 64.8%,61.7%, 100% and 68.2% respectively. Agreements of Titmus ranged from 63.2% (NearVA Both eyes) to 100% (color perception.)
Titmus proved to be a valid test for color vision deficiency. Titmuscan also be used as an occupational vision screener for the assessment of distance andnear visual acuity, but with poor diagnostic criteria. According to Titmus’s moderatesensitivity and specificity, Titmus is not suggested to be used for stereoacuity test. It isrecommended that further clinical investigation to be undertaken for a more accuratediagnosis of the extent of abnormal visual performance among those whose tests arepositive for Titmus.
occupational vision test, occupational health, titmus V4 occupationallandolt model, sensitivity, specificity
Received: July 2, 2019
Revision received: July 12, 2019
Accepted after revision: July 28, 2019
BKK Med J 2019;15(2): 140-144.