TABLE 3.
Refractive error, ocular biometry, and visual field before and after HDTBR
| Measurement | Condition | Pre‐HDTBR | Post‐HDTBR | p |
|---|---|---|---|---|
| SE Refractive Error (D) | Control |
−0.18 −1.27 to +0.91 |
+0.09 −1.00 to +1.19 |
0.19 |
| cAG |
−0.26 −0.98 to +0.46 |
−0.31 −0.91 to +0.30 |
0.56 | |
| iAG |
−0.38 −1.23 to +0.48 |
−0.47 −1.44 to +0.50 |
0.26 | |
| Axial Length (mm) | Control |
23.70 23.05–24.36 |
23.71 23.03–24.38 |
0.74 |
| cAG |
24.06 23.54–24.57 |
24.06 23.54–24.59 |
0.77 | |
| iAG |
23.75 23.33–24.17 |
23.78 23.34–24.21 |
0.12 | |
| Anterior Chamber Depth (mm) | Control |
3.64 3.44–3.83 |
3.59 3.38–3.79 |
0.04 |
| cAG |
3.62 3.40–3.85 |
3.63 3.40–3.86 |
0.63 | |
| iAG |
3.57 3.43–3.71 |
3.55 3.39–3.71 |
0.39 | |
| Avg. Corneal Curvature (mm) | Control |
7.74 7.62–7.87 |
7.72 7.60–7.85 |
0.10 |
| cAG |
7.87 7.70–8.04 |
7.88 7.71–8.05 |
0.28 | |
| iAG |
7.82 7.67–7.97 |
7.82 7.68–7.97 |
0.94 | |
| Visual Field MD (dB) | Control |
+0.62 −0.46 to +1.69 |
+1.00 −0.15 to +2.15 |
0.38 |
| cAG |
+0.24 −0.46 to +0.93 |
+0.26 −0.48 to +1.00 |
0.95 | |
| iAG |
−0.39 −1.41 to +0.63 |
−0.12 −0.95 to +0.71 |
0.45 | |
| Visual Field PSD (dB) | Control |
7.81 4.38–11.24 |
7.02 5.33–8.71 |
0.61 |
| cAG |
7.98 2.48–13.48 |
6.76 4.39–9.13 |
0.51 | |
| iAG |
6.28 2.17–10.40 |
9.07 3.83–14.31 |
0.13 |
Ophthalmological measurements collected before and after head‐down tilt bed rest (HDTBR). Values represent the mean and 95% CI (italics). No significant differences were detected between control and either AG group for any parameter.
Abbreviations: cAG, continuous artificial gravity; iAG, intermittent artificial gravity; MD, mean deviation; PSD, pattern standard deviation; SE, spherical equivalent.