Senzitivita a specificita metod pro měření astigmatismu oka
| Title in English | Sensitivity and specificity in methods for examination of the eye astigmatism |
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| Authors | |
| Year of publication | 2019 |
| Type | Article in Periodical |
| Magazine / Source | Česká a slovenská oftalmologie |
| MU Faculty or unit | |
| Citation | |
| Web | stranky casopisu |
| Keywords | Subjective refraction; objective refraction; sensitivity; specificity; Jackson crossed cylinder; fogging method |
| Description | Purpose: We usually use objective and subjective methods for examination of the eye astigmatism in optometry, respectively ophthalmology. Objective methods enable to measure sphere-cylindrical refraction of the eye. If we want to prescribe new glasses or contact lenses we usually use subjective methods. We want to measure sensitivity and specificity of some subjective and objective methods for examination of the eye astigmatism. We supposed that automatic objective refraction will be the most exact method so we choose this method as the reference method. For comparison we chose subjective methods Jackson crossed cylinders (JCC), fogging method (FM) and objective method Spot Vision Screener (SVS, WelschAllyn). Materials and methods: We had in total 30 subjects with average age 23 years (SD 1 year) in our study. We made more than one measurement per eye and it was independent measurement so we could use measurement from each eye (n = 60). Each eye was firstly measured by subjective met. Each eye was firstly measured by subjective method FM, followed by JCC method and finally was use objective method Spot Vision Screener (SVS, WelschAllyn). Measurement with objective instrument TRK-1P (TOPCON) was use as reference measurement. Results: In variable FM we measured sensitivity 76.2 % and specificity 66.7 %. Criterion for positive finding was -0.25 D. Result was statistically significant on level p < 0.001. In variable JCC we measured sensitivity 95.2 % and specificity 66.7 %. Criterion for positive finding was -0.25 D. Result was statistically significant on level p < 0.001. In variable SVS we measured sensitivity 47.6 % and specificity 94.4 %. Criterion for positive finding was -0.75 D. Result was statistically significant on level p < 0.001. Direct comparison of all methods showed statistically important difference between techniques JCC and FM (p = 0.0095). In other method we did not find statistically important difference (FM vs. SVS, p = 0.526 and JCC vs. SVS, p = 0.105). Conclusion: All subjective and objective techniques were statistically significant in detection of eye astigmatism. Comparison of ROC curves showed statistically significant difference between FM and JCC technique. All results were statistically significant on level p = 0.05. |
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