Data collected for cases and controls in standardised face-to-face questionnaire
| Collected data | Description | |
| Data collected for cases and controls | Demographics | Age, sex |
| Lens type | RGP, SDD, STWD, SMD or SEW | |
| Wear habits and water exposure | Wear frequency, wear duration Sleeping in lenses Showering/bathing in lenses Swimming in lenses | |
| Hygiene practices | Hand washing before handling lenses Lens case use, storage location and replacement frequency Contact lens soaking duration | |
| Lens purchasing history and follow-up | Frequency of contact lens aftercare appointment with contact lens practitioner Where lenses are purchased Were lens infections/complications explained when lenses first prescribed? Who should be responsible for providing information about risks of contact lens wear? How lens care advice should be given | |
| Additional data collected for cases of CLMK | Subjective vision loss after infection | None, mild, moderate or severe |
| Thoughts of giving up contact lenses after infection | Concerns over recurrence, vision loss, memories of symptoms | |
| Quality of life after infection | Affecting work, sight, sports, daily activities, physical appearance |
Additional data were collected for cases of CLMK regarding patient experiences following infection.
CLMK, contact lens-related microbial keratitis; RGP, rigid gas permeable; SDD, soft daily disposable; SEW, soft extended wear; SMD, soft monthly disposable; STWD, soft 2-week disposable.