'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease
Now coming to the safety of eyes, do not use spectacles unless you are asked to do so by an eye specialist. But if you have spectacles then wear it regularly. If you are irregular at it, then the number of your spectacles will increase gradually. While watch tv, sitting on PC or playing video games, please maintain a certain safety distance for your eyes. Also, avoid studying or doing any work under a dim light as it can increase stress on your eyes. Wear a helmet when you go out as it will protect your eyes from the dust particles entering it thereby protecting your eyes from infection.
If you follow this strictly your eyes will remain safe and healthy. Intake of fruits like apple and papaya and fruits containing vitamin A are good for your eyesight. You can also add "Seven Seas Seacod" in your diet which is a cod liver oil capsule good for your eyes. I am too taking these things in my daily diet and so suggesting you too. I hope this finds you helpful.
If you are using prescription eyeglasses, wear them as recommended by the doctor. Though the power will not improve, it will probably prevent them from worsening.
There are eye exercises that help improve vision. Some of them are covered in Mohan's response. You can check the internet for specific exercises that can improve vision.
"A love affair with knowledge will never end in heartbreak" - Michael Garrett Marino