CVS refers to 1. wrist injuries brought about by incorrect hand position when using a keyboard. 2. a business practice that attempts to evaluate the intangible values of computer systems. 3. eyestrain related to computer display screen use. carpal vision syndrome. 4. a type of antivirus protection software.

3. eyestrain related to computer display screen use. carpal vision syndrome.

Explanation:

Computer vision syndrome (CVS) is a computer related eye defect, that is caused by a long period of looking at a computer screen. It is also known as digital eyestrain, as the long exposure of the eyes to the light emitted from the screen, may cause blur visions, eyestrain, dry eye, headaches and even neck and shoulder pain.

Other cause of CVS symptoms are the poor sitting posture, close distance to screen, poor lighting, existing eye defect etc.

To reduce the chances of CVS, there should be proper lighting, good sitting posture, time off from looking at the screen etc.

this would definitely be a.

explanation:

(because i need 20 chars)