Fig 1.
Position of the mouth-nose mask during visual field testing.
Position1.5cm_no_clip (top): 1.5 cm below the lower eyelid without using the nose clip; position1.5cm_with_clip (middle): 1.5 cm below the lower eyelid with use the nose clip; position0.5cm_with_clip (bottom): 0.5 cm below the lower eyelid using the nose clip.
Fig 2.
90° perimetry, displaying the 14 defined test-points.
Fig 3.
Differences in sensitivity between the different mask positions (A: Position1.5cm_no_clip; B: Position1.5cm_with_clip; C: Position0.5cm_with_clip) and without wearing a mask (Δ): Mean Δ sensitivity; the square represents significant differences (p<0.05), the circle represents no significant difference; significant reductions Δ were observed for P7 (all three positions) and P8 (position1.5cm_no_clip).
Table 1.
Mean sensitivity.
Fig 4.
Differences in sensitivity between D: Position1.5cm_no_clip compared to position1.5cm_with_clip and E: Position0.5cm_with_clip compared to position1.5cm_with_clip; mean Δ sensitivity; the square represents significant differences (p<0.05); the circle represents no significant difference.