Table 3: Subjective preferences of the prismatic and the non-prismatic correction in both groups. The bold marked preferences vary (between examination and 2nd check-up) at statistically significant level p < 0.05 (column „Wilcoxon test results). *There were 2 volunteers unable to participate on trial wearing of prismatic spectacles for near vision in the main group and one of them wasn’t able to undergo the binocular refraction examination at near at all.

Subjective preferences of correction type (number of subjects)*

Categories/Groups & Preferences

STABILITY

VA

COMFORT

After exam.

After 2nd check-up

Wilcoxon test results (p)

After exam.

After 2nd check-up

Wilcoxon test results (p)

After exam.

After 2nd check-up

Wilcoxon test results (p)

Group  A

Far

Non-prism

1

7

0.0117

2

9

0.0843

4

10

0.0178

Any difference

6

5

9

4

3

3

Prism

10

5

6

4

10

4

Near

Non-prism

0

3

0.0180

1

5

0.1235

1

4

0.0500

Any difference

7

9

7

5

6

7

Prism

9

3

8

5

9

4

Group  B

Far

Non-prism

3

8

0.0423

6

8

0.3078

8

12

0.2213

Any difference

10

8

5

6

6

4

Prism

4

1

6

3

3

1

Near

Non-prism

1

4

0.3452

1

7

0.0995

1

7

0.1579

Any difference

12

10

9

6

9

6

Prism

4

3

7

4

7

4