Computers can have a detrimental effect on health staring at a screen for extended periods of time can cause symptoms such as headache dry eyes blurred vision and pain in the shoulders and neck

Incomplete/unclear question. I assumed you want to know if the statement is true or false.

True

Explanation:

Indeed, many people, as well as many health professionals agree that part of the detrimental effects of staring  at a computer screen for extended periods of time could result in symptoms such as

The condition has been medically termed, "Computer Vision Syndrome ." Hence, it is recommended one takes at least 15 minutes break for every 2 hours of staring at computers.

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.