Table 1: Binocular visual acuity (BVA) and
binocular summation (BS) of BVA in the group A (patients with central retinal
impairment) with prismatic and non-prismatic correction after the entry
examination and after 30-day trial wearing. The bold marked pairs (prism vs.
non-prism) vary at statistically significant level p < 0.05 (column
„Wilcoxon test results). Number behind BVA and BS signs the Weber’s contrast
level; „total“ = sum of ETDRS letters, correctly read at all
contrast levels.
Group A. binocular visual acuity (BVA) and summation (BS) |
|||||||
After examination |
Mean
values | Standard deviations |
Wilcoxon test results (p) |
|||||
At a distance (number of ETDRS letters) |
Prism |
Non-prism |
Difference |
||||
BVA (full contrast) |
80.588 |
12.679 |
79.412 |
11.336 |
1.176 |
3.695 |
0.167 |
BVA (50% contrast) |
77.706 |
12.348 |
77.412 |
12.947 |
0.294 |
1.929 |
0.529 |
BVA (25% contrast) |
73.941 |
13.836 |
71.294 |
14.451 |
2.647 |
4.315 |
0.032 |
BVA (10% contrast) |
60.824 |
15.163 |
59.059 |
15.762 |
1.765 |
2.969 |
0.023 |
BVA (sum of all contrast levels) |
293.059 |
52.996 |
287.176 |
52.551 |
5.882 |
7.817 |
0.006 |
BS (full contrast) |
0.529 |
2.875 |
-0.647 |
4.212 |
1.176 |
3.695 |
0.167 |
BS (50% contrast) |
0.941 |
3.191 |
0.647 |
3.161 |
0.294 |
1.929 |
0.529 |
BS (25% contrast) |
1.412 |
3.374 |
-1.235 |
5.847 |
2.647 |
4.315 |
0.032 |
BS (10% contrast) |
3.353 |
3.823 |
1.588 |
3.447 |
1.765 |
2.969 |
0.023 |
BS (sum of all contrast levels) |
6.235 |
8.166 |
0.353 |
13.048 |
5.882 |
7.817 |
0.006 |
At near distances (decimal) |
|
|
|
|
|
|
|
BVA |
0.871 |
0.229 |
0.821 |
0.237 |
0.050 |
0.269 |
0.012 |
BS |
0.032 |
0.058 |
-0.027 |
0.059 |
0.059 |
0.081 |
0.012 |
After 30-day trial wearing |
Mean values | Standard deviations |
Wilcoxon test results (p) |
|||||
At a distance (number of ETDRS letters) |
Prism |
Non-prism |
Difference |
||||
BVA (full contrast) |
80.647 |
11.816 |
79.353 |
12.257 |
1.294 |
3.312 |
0.132 |
BVA (50% contrast) |
77.529 |
12.625 |
77.059 |
13.021 |
0.471 |
4.732 |
0.950 |
BVA (25% contrast) |
72.941 |
12.765 |
71.471 |
13.125 |
1.471 |
3.955 |
0.088 |
BVA (10% contrast) |
56.882 |
15.341 |
57.118 |
15.194 |
-0.235 |
6.006 |
0.938 |
BVA (sum of all contrast levels) |
288.000 |
51.116 |
285.000 |
52.709 |
3.000 |
13.143 |
0.332 |
BS (full contrast) |
1.000 |
2.806 |
0.000 |
3.041 |
1.000 |
4.213 |
0.320 |
BS (50% contrast) |
0.882 |
4.729 |
-0.647 |
4.795 |
1.529 |
5.680 |
0.414 |
BS (25% contrast) |
1.529 |
3.955 |
-0.529 |
4.361 |
2.059 |
4.867 |
0.093 |
BS (10% contrast) |
1.765 |
8.318 |
0.529 |
4.033 |
1.235 |
6.969 |
0.421 |
BS (sum of all contrast levels) |
5.176 |
16.576 |
-0.647 |
13.852 |
5.824 |
14.943 |
0.326 |
At near distances (decimal) |
|
|
|
|
|
|
|
BVA |
0.858 |
0.245 |
0.818 |
0.261 |
0.040 |
0.075 |
0.076 |
BS |
0.048 |
0.085 |
-0.003 |
0.066 |
0.051 |
0.074 |
0.028 |