Elite School of Optometry, Unit of Medical Research Foundation, St Thomas Mount, Chennai 600 016, India.
Ophthalmic Physiol Opt. 2009 Sep;29(5):526-534. doi: 10.1111/j.1475-1313.2009.00657.x.
To design, construct and validate a new Tamil logMAR visual acuity chart based on current recommendations.
Ten Tamil letters of equal legibility were identified experimentally and were used in the chart. Two charts, one internally illuminated and one externally illuminated, were constructed for testing at 4 m distance. The repeatability of the two charts was tested. For validation, the two charts were compared with a standard English logMAR chart (ETDRS).
When compared to the ETDRS chart, a difference of 0.06 +/- 0.07 and 0.07 +/- 0.07 logMAR was found for the internally and externally illuminated charts respectively. Limits of agreement between the internally illuminated Tamil logMAR chart and ETDRS chart were found to be (-0.08, 0.19), and (-0.07, 0.20) for the externally illuminated chart. The test - retest results showed a difference of 0.02 +/- 0.04 and 0.02 +/- 0.06 logMAR for the internally and externally illuminated charts respectively. Limits of agreement for repeated measurements for the internally illuminated Tamil logMAR chart were found to be (-0.06, 0.10), and (-0.10, 0.14) for the externally illuminated chart.
The newly constructed Tamil logMAR charts have good repeatability. The difference in visual acuity scores between the newly constructed Tamil logMAR chart and the standard English logMAR chart was within acceptable limits. This new chart can be used for measuring visual acuity in the literate Tamil population.
根据当前的建议，设计、构建和验证一种新的泰米尔语对数视力表。
通过实验确定了 10 个具有相同易读性的泰米尔字母，并将其用于图表中。制作了两个图表，一个内部照明，一个外部照明，用于在 4 米距离进行测试。测试了两个图表的可重复性。为了验证，将这两个图表与标准的英语对数视力表（ETDRS）进行了比较。
与 ETDRS 图表相比，内部照明和外部照明图表的差异分别为 0.06 +/- 0.07 和 0.07 +/- 0.07 logMAR。内部照明泰米尔语 logMAR 图表与 ETDRS 图表之间的一致性界限为 (-0.08, 0.19)，外部照明图表为 (-0.07, 0.20)。测试-重测结果显示，内部照明和外部照明图表的差异分别为 0.02 +/- 0.04 和 0.02 +/- 0.06 logMAR。内部照明泰米尔语 logMAR 图表重复测量的一致性界限为 (-0.06, 0.10)，外部照明图表为 (-0.10, 0.14)。
新构建的泰米尔语对数视力表具有良好的可重复性。新构建的泰米尔语对数视力表与标准英语对数视力表的视力评分差异在可接受范围内。这种新图表可用于测量识字泰米尔人群的视力。
