Table 3.

Adverse events related to intervention

	Sham mask (n=153)	Light mask (n=155)
Eyes
Corneal abrasion, corneal ulcer	3	0
Mask causing pressure on eyes, pain on eyes, uncomfortable masks	7	14
Sore eyebrows, sore eyelids	0	2
Subconjunctival haemorrhage	0	1
Vision deterioration, disturbance	1	2
Watery eyes, sore eyes, sticky eyes, painful eyes, conjunctivitis	6	14
Neurological
Headache, severe persistent headache	0	2
Psychiatric
Insomnia	0	1
Musculoskeletal
Left-sided neck and skull pain	0	1
Dermatological
Scratched face on two occasions getting mask off during sleep	1	0
Sore skin, small lump on side of right eye	0	1
Pod moving around in mask when turns in bed	0	1
Wart	0	1
Other
Mask slipping off head	3	3
Sleep disturbance, bad dreams	1	7