DNA Special: What is Computer Vision Syndrome? Know cause, 20-20-20 rule for screen time

Imagine if you switched off the lights and then started checking your mobile before going to sleep, but suddenly you are unable to see.

DNA Special: What is Computer Vision Syndrome? Know cause, 20-20-20 rule for screen time
Imagine if you switched off the lights and then started checking your mobile before going to sleep, but suddenly you are unable to see.