Computer Vision Syndrome among Undergraduate Medical Students in King Abdulaziz University, Jeddah, Saudi Arabia

Table 2

Association between preventive measures taken by students during studying using computers and the presence of computer vision syndrome.

Variable	Groups	Computer vision syndrome				Total		value
		Positive		Negative		N	(%)
		N	(%)	N	(%)
20-20-20 rule; Taking short breaks every 20 minutes for 20 seconds and looking at objects at least 20 feet away	Always/very often	198	91.7	18	8.3	216	100	0.01
	Occasionally	145	98.0	3	2.0	148	100
	Rarely/never	215	96.4	8	3.6	223	100
Frequent blinking	Always/very often	147	93.6	10	6.4	157	100	0.40
	Occasionally	107	97.3	3	2.7	110	100
	Rarely/never	304	95.0	16	5.0	320	100
Location of the screen; More than arm and forearm length from the eyes and below the level of the eyes	Always/very often	196	92.5	16	7.5	212	100	0.04
	Occasionally	151	95.0	8	5.0	159	100
	Rarely/never	211	97.7	5	2.3	216	100
Lightning; Using an overhead lighting from ceiling other than a desk lamp or light hitting directly on the eyes	Always/very often	309	95.1	16	4.9	325	100	0.95
	Occasionally	85	94.4	5	5.6	90	100
	Rarely/never	164	95.3	8	4.7	172	100
Sitting location; Avoiding sitting at a location where there is direct blow of air to the eyes or where there is light reflected on the screen	Always/very often	282	95.3	14	4.7	296	100	0.91
	Occasionally	98	94.2	6	5.8	104	100
	Rarely/never	178	95.2	9	4.8	187	100
Use of an antiglare screen	Always/very often	103	92.8	8	7.2	111	100	0.39
	Occasionally	46	93.9	3	6.1	49	100
	Rarely/never	409	95.8	18	4.2	427	100

value statistically significant.