Table 1. Tear parameters in healthy subjects. Mean value and standard deviation (SD) over all time points of the investigated parameters in comparison to literature values in healthy subjects.
| Parameter | Mean ± SD | Literature values |
|---|---|---|
| Tear film thickness - TFT (µm) | 4.17 ± 0.50 | 3.4 ± 2.6 [33] 4.4 ± 0.97 (3 subjects) [34] 4.79 ± 0.88 [6] 6.0 ± 2.4 [5] |
|
| ||
| Lipid layer thickness - LLT (nm) | 63.8 ± 9.96 | 62.4 ± 14.5 (3 subjects) [34] 68.3 ± 13.7 [35] |
|
| ||
| Tear meniscus area - TMA (mm2) | 0.0174 ± 0.007 | 0.02 ± 0.001 (male) [36] 0.02 ± 0.03 (female) [36] 0.022 ± 0.008 [11] 0.031 ± 0.012 [13] 0.048 (median) [15] |
|
| ||
| Tear meniscus height - TMH (mm) | 0.272 ± 0.069 | 0.22 ± 0.065 [17] 0.234 ± 0.071 (male) [36] 0.256 ± 0.057 [11] 0.262 ± 0.122 (female) [36] 0.291 ± 0.062 [13] 0.30 (median) [37] 0.316 (median) [15] |
|
| ||
| Tear meniscus depth - TMD (mm) | 0.191 ± 0.049 | 0.185 ± 0.042 [38] 0.188 ± 0.057 [39] 0.22 ± 0.065 [13] |
|
| ||
| Tear meniscus radius - TMR (mm) | 0.309 ± 0.123 | 0.29 ± 0.09 [40] 0.33 ± 0.08 [41] 0.545 ± 0.259 [28] |
|
| ||
| Schirmer I test (mm) | 25.1 ± 12.2 | 15.5 ± 8.7 [42] |
|
| ||
| Fluorescein breakup time - FBUT (s) | 8.8 ± 2.4 | 7.6 ± 10.4 [43] 9.1 ± 3.51 [42] |