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Table 3 Results of the PCA conducted on FGVS items (N = 295).

From: Measuring benefits and patients' satisfaction when glasses are not needed after cataract and presbyopia surgery: scoring and psychometric validation of the Freedom from Glasses Value Scale (FGVS©)

 

Factor 1

Factor 2

Factor 3

Factor 4

Eigenvalue for each factor

8.51

2.98

1.32

1.11

Proportion of variance explained by each factor

0.41

0.14

0.06

0.05

Factor loadings for each item:

    

2. Change in life since operation

0.84

0.21

0.03

0.07

12. Feelings since operation... Comfort

0.84

0.14

0.22

0.20

20. Willingness to undergo surgery again

0.83

0.11

0.01

0.01

14. Feelings since operation... Well-being

0.82

0.11

0.18

0.30

13. Feelings since operation... Freedom

0.82

0.08

0.17

0.26

19. Eyesight problems in the past

0.76

0.11

0.15

0.10

21. Willingness to recommend to others

0.76

0.07

0.07

0.06

1. Evaluation of eyesight since operation

0.73

0.23

-0.03

-0.07

16. Feelings since operation... Having new eyes

0.68

0.13

0.20

0.25

15. Feelings since operation... Youth

0.55

0.12

0.13

0.41

10. Stop wearing glasses because... No worry about losing glasses

0.14

0.86

0.10

0.15

8. Stop wearing glasses because... No worry about breaking glasses

0.21

0.83

0.22

0.10

9. Stop wearing glasses because... No worry about scratching glasses

0.17

0.80

0.33

0.10

11. Stop wearing glasses because... Pressing on nose

0.15

0.57

0.27

0.19

7. Stop wearing glasses because... Frames restrictive

0.20

0.51

0.44

0.11

5. Stop wearing glasses because... Sliding down nose

0.11

0.20

0.79

0.16

6. Stop wearing glasses because... Cleaning lenses

0.17

0.29

0.78

0.13

4. Stop wearing glasses because... Lenses steaming up

0.09

0.33

0.74

-0.05

17. Self-image

0.20

0.13

0.00

0.83

18. Other people's image of you

0.14

0.21

0.09

0.69

3. Bother of wearing glasses

-0.14

-0.09

-0.41

-0.50

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BMC Ophthalmology

ISSN: 1471-2415

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