Table 1.

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.