Table 6: Binocular
summation of visual acuity (BS) with prismatic correction in both groups
immediately after the entry examination and after 30-day trial wearing. Values
at a distance represents count of recognized ETDRS letters, values at near
distances (BS near) are recorded in decimal scale. The bold marked pairs vary
at statistically significant level p <
0.05.
|
Binocular summation (BS) of BVA
with prismatic correction |
||||||
|
After examination |
Mean values | Standard deviations |
Difference |
Mann-Whitney U Test results (p) |
|||
|
At a distance (number of ETDRS letters) |
Group A |
Group B |
||||
|
BS (full
contrast) |
0.529 |
2.875 |
1.353 |
2.317 |
-0.824 |
0.328 |
|
BS (50%
contrast) |
0.941 |
3.191 |
0.824 |
2.834 |
0.118 |
0.986 |
|
BS (25%
contrast) |
1.412 |
3.374 |
0.647 |
2.827 |
0.765 |
0.473 |
|
BS (10%
contrast) |
3.353 |
3.823 |
2.471 |
3.939 |
0.882 |
0.958 |
|
BS (sum of
all contrast levels) |
6.235 |
8.166 |
5.294 |
8.651 |
0.941 |
0.782 |
|
At near
distances (decimal) |
|
|
|
|
|
|
|
BS
(minimum legible) |
0.032 |
0.058 |
0.006 |
0.025 |
0.026 |
0.036 |
|
After
30-day trial wearing |
Mean
values | Standard deviations |
Difference |
Mann-Whitney
U Test results (p) |
|||
|
At a
distance (number of
ETDRS letters) |
Group A |
Group B |
||||
|
BS (full
contrast) |
1.000 |
2.806 |
0.706 |
1.312 |
0.294 |
0.538 |
|
BS (50%
contrast) |
0.882 |
4.729 |
1.176 |
2.298 |
-0.294 |
0.332 |
|
BS (25%
contrast) |
1.529 |
3.955 |
0.471 |
2.695 |
1.059 |
0.405 |
|
BS (10%
contrast) |
1.765 |
8.318 |
1.941 |
3.288 |
-0.176 |
0.756 |
|
BS (sum of
all contrast levels) |
5.176 |
16.576 |
4.294 |
5.497 |
0.882 |
0.849 |
|
At near
distances (decimal) |
|
|
|
|
|
|
|
BS
(minimum legible) |
0.048 |
0.085 |
0.006 |
0.024 |
0.042 |
0.052 |