Sometimes my eyes are blurry but will be fine after rubbing, my legs also sometimes become weak when i carry something heavy. what happen with me?

Eyesight & Exercise: If you continue to look at the computer without blinking, that happens; usually from not blinking frequently. Nothing to worry. Your muscles are not use to put to work. Exercise at least twice a week should help.

Blurred vision: It is hard to say why you have blurred vision. Some causes could include dry eye, refractive errors such as astigmatism or a number of conditions. There are numerous possible causes. If the symptom continues, I would suggest a comprehensive eye exam.