Variance Components Affecting the Repeatability of the Alternating Cover Test
Abstract
:Introduction
Methods
Participants
Design
Materials and procedure of the manual prism cover test
Materials for the automated alternating cover test
Procedure of the automated alternating cover test
Statistics
Results
Systematic differences between manual and automated cover test
Repeatability across days and trials
The heterophoria noise across days or blocks was not reflected in the heterophoria noise across trials
Discussion
Limitations and comparability with previous studies
The relative contribution of different noise sources in the manual prism cover test
Systematic differences between manual and automated cover test
Conclusion
Acknowledgments
References
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Source | d.f. | MS [deg2] | F | Prob>F | Type | MS denom [deg2] | d.f. denom |
---|---|---|---|---|---|---|---|
subj | 14 | 49.825 | 22.800 | <0.0001 | random | 2.1852 | 27.82 |
day | 2 | 1.0835 | 0.494 | 0.615 | fixed | 2.1921 | 28 |
trial | 18 | 0.0451 | 1.259 | 0.215 | fixed | 0.0358 | 252 |
day*trial | 36 | 0.0304 | 0.712 | 0.895 | fixed | 0.0427 | 504 |
subj*day | 28 | 2.1921 | 51.354 | <0.0001 | random | 0.0427 | 504 |
subj*trial | 252 | 0.0358 | 0.840 | 0.942 | random | 0.0427 | 504 |
subj*day*trial | 504 | 0.0427 | Inf | NaN | random | 0 | 0 |
Source | d.f. | MS [deg2] | F | Prob>F | Type | MS denom [deg2] | d.f. denom |
---|---|---|---|---|---|---|---|
subj | 4 | 81.792 | 37.118 | <0.0001 | random | 2.2036 | 15.82 |
block | 4 | 15.190 | 6.856 | 0.002 | fixed | 2.2155 | 16 |
trial | 18 | 0.0908 | 1.244 | 0.252 | fixed | 0.0730 | 72 |
block*trial | 72 | 0.0749 | 0.882 | 0.734 | fixed | 0.0849 | 288 |
subj*block | 16 | 2.2155 | 26.094 | <0.0001 | random | 0.0849 | 288 |
subj*trial | 72 | 0.0730 | 0.860 | 0.776 | random | 0.0849 | 288 |
subj*block*trial | 288 | 0.0849 | Inf | NaN | random | 0 | 0 |
Study | Measurement method | Viewing distance (cm) | Phoria angle (deg) mean±sd | Within-subject variance across days MSwithin (deg2) | Within-subject sd across days (deg) |
---|---|---|---|---|---|
Hirsch & Bing [7] | von Graefe prism- diplopia test | 40 | -2.66±2.97 | 1.14 | 1.07 |
Morgan 1955 [8] | screen-Maddox rod test | 600 | -0.39±1.53 | 0.52 | 0.72 |
Johns et al. [9] | manual prism cover test | 40 | -1.46±2.57 | 0.55 | 0.74 |
Current study (manual) | manual prism cover test | 128 | -0.57±0.58 | 0.26 | 0.51 |
Current study (auto) | automated alternating cover test | 128 | -1.11±0.93 | 0.12 | 0.34 |
Mestre et al. [13] | automated monocular cover-uncover test | 40 | -0.63±1.87 | 0.17 | 0.41 |
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Paulus, M.M.; Straube, A.; Eggert, T. Variance Components Affecting the Repeatability of the Alternating Cover Test. J. Eye Mov. Res. 2019, 12, 1-13. https://doi.org/10.16910/jemr.12.4.3
Paulus MM, Straube A, Eggert T. Variance Components Affecting the Repeatability of the Alternating Cover Test. Journal of Eye Movement Research. 2019; 12(4):1-13. https://doi.org/10.16910/jemr.12.4.3
Chicago/Turabian StylePaulus, Marius M., Andreas Straube, and Thomas Eggert. 2019. "Variance Components Affecting the Repeatability of the Alternating Cover Test" Journal of Eye Movement Research 12, no. 4: 1-13. https://doi.org/10.16910/jemr.12.4.3
APA StylePaulus, M. M., Straube, A., & Eggert, T. (2019). Variance Components Affecting the Repeatability of the Alternating Cover Test. Journal of Eye Movement Research, 12(4), 1-13. https://doi.org/10.16910/jemr.12.4.3