The questions analysed in the study
| Questionnaire I |
| Before cataract surgery |
| 1 Do you have a valid driving licence? |
| (a) No, never have had |
| (b) No, but I have had one earlier. Go to question 5 |
| (c) Yes. Go to question 2 |
| 2 Do you currently drive a car? |
| (a) Yes. Go to question 3 |
| (b) No. Go to question 5 |
| 3 How much difficulty do you have driving during the day because of your vision? |
| Do you have |
| (a) No difficulty |
| (b) A little difficulty |
| (c) A moderate amount of difficulty |
| (d) A great deal of difficulty |
| 4 How much difficulty do you have driving at night because of your vision? |
| Do you have |
| (a) No difficulty |
| (b) A little difficulty |
| (c) A moderate amount of difficulty |
| (d) A great deal of difficulty |
| (e) Do not drive because of vision |
| 5 When did you cease driving? |
| (a) Less than 6 months ago |
| (b) 6–12 months ago |
| (c) More than 12 months ago |
| 6 Why did you stop driving? |
| (a) Vision too bad |
| (b) Other illness |
| (c) Other reason |
| Questonnaire II |
| After cataract surgery |
| Questions 2, 3, and 4 from questionnaire I were used |
| Questionnaire III |
| 5 years after cataract surgery |
| Questions 1–6 from questionnaire I were used |