Correct:
The radiation destroys eye health. Everyone knows using technologies is not good for eyes. But it's already part of our lives so we can't stop using technologies.The first way to protect our eyes from radiation is making letters bigger. One of the reasons that we look smartphone so closely is the small letters. When the letters become bigger, making a proper distance from technologies, such as smartphone, would be easier.The second way is exercising the eyes. Press around eyes with two fingers. Next, press temple softly, and press harder and harder. After that, cover eyes perfectly with warm hands.

Explanation:

Jonathen:distroy
Correct:destroy
1. Be mindful of the correct spelling of words.

Jonathen: The radiation distroy eye health.
Correct:The radiation destroys eye health.
2. A singular subject takes a singular verb.

Jonathen:One of the reason
Correct:One of the reasons
3. You are referrring to 'one' out of the many things.

Comment:

Thank you for sharing those tips! I hope you also practice those things in order to take care of your eyes. ^^