Table 2.

Signs and symptoms of eye strain related to using digital devices as perceived by survey participants

	Title	Always		Sometimes		Never	Score
		Severe	Average	Severe	Average		Median (IQR)
1	Burning	35	176	58	1226	514	2.0 (0.0; 2.0)
2	Itching	69	168	96	1267	409	2.0 (0.0; 2.0)
3	Foreign body sensation	54	100	37	835	983	0.0 (0.0; 2.0)
4	Tears (watering)	144	263	58	1145	399	2.0 (0.0; 2.0)
5	Excessive blinking	50	108	34	711	1105	0.0 (0.0; 2.0)
6	Redness	92	123	74	986	734	2.0 (0.0; 2.0)
7	Eye pain	55	106	67	877	906	0.0 (0.0; 2.0)
8	Drooping eyelids	47	74	33	592	1263	0.0 (0.0; 2.0)
9	Dryness of eyes	74	101	36	685	1113	0.0 (0.0; 2.0)
10	Blurring of vision	98	87	60	740	1024	0.0 (0.0; 2.0)
11	Double vision	40	52	33	484	1400	0.0 (0.0; 2.0)
12	Difficulty in focusing near object	101	81	55	820	1052	0.0 (0.0; 2.0)
13	Intolerance to light	174	143	75	702	915	0.0 (0.0; 2.0)
14	Seeing colored halos	62	54	16	530	1347	0.0 (0.0; 2.0)
14	Feeling of worsening eyesight	99	80	50	759	1021	0.0 (0.0; 2.0)
15	Headache	250	195	170	992	402	2.0 (0.0; 4.0)