Question pretext
(If respondent normally wears glasses or contact lenses, should ask the following Qs as “Since starting to wear glasses/contact lenses….”.)
Literal question
If yes, when was the last time? months
Categories
Value |
Category |
0 |
|
1 |
|
2 |
|
3 |
|
4 |
|
5 |
|
6 |
|
8 |
|
97 |
N/A |
98 |
Don't Know |
99 |
Missing |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.
Interviewer instructions
Interviewer: Enter years or months ago. Enter "00" if less than 1 year or 1 month ago.