Table 7: Binocular summation of visual acuity (BS) with
non-prismatic correction in both groups immediately after the entry examination
and after 30-day trial wearing. Values at a distance represents the 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
non-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) |
-0.647 |
4.212 |
1.824 |
2.921 |
-2.471 |
0.045 |
|
BS (50%
contrast) |
0.647 |
3.161 |
1.000 |
2.574 |
-0.353 |
0.481 |
|
BS (25%
contrast) |
-1.235 |
5.847 |
1.647 |
3.061 |
-2.882 |
0.170 |
|
BS (10%
contrast) |
1.588 |
3.447 |
3.000 |
4.690 |
-1.412 |
0.210 |
|
BS (sum of
all contrast levels) |
0.353 |
13.048 |
7.471 |
10.180 |
-7.118 |
0.088 |
|
At near
distances (decimal) |
|
|
|
|
|
|
|
BS
(minimum legible) |
-0.027 |
0.059 |
-0.006 |
0.043 |
-0.021 |
0.307 |
|
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) |
0.000 |
3.041 |
1.647 |
2.422 |
-1.647 |
0.126 |
|
BS (50%
contrast) |
-0.647 |
4.795 |
1.235 |
2.611 |
-1.882 |
0.275 |
|
BS (25%
contrast) |
-0.529 |
4.361 |
1.882 |
3.039 |
-2.412 |
0.111 |
|
BS (10%
contrast) |
0.529 |
4.033 |
2.941 |
3.211 |
-2.412 |
0.100 |
|
BS (sum of
all contrast levels) |
-0.647 |
13.852 |
7.824 |
6.849 |
-8.471 |
0.088 |
|
At near
distances (decimal) |
|
|
|
|
|
|
|
BS
(minimum legible) |
-0.003 |
0.066 |
0.000 |
0.000 |
-0.003 |
0.278 |