preferred_name: Level of difficulty doing usual activities because of glare when not wearing corrective lenses in past 7 days
preferred_name_lc: level of difficulty doing usual activities because of glare when not wearing corrective lenses in past 7 days
label: Level of difficulty doing usual activities because of glare when not wearing corrective lenses in past 7D
label_lc: level of difficulty doing usual activities because of glare when not wearing corrective lenses in past 7d