Talk to Eye Specialist on Eye Vision Become Blury

Aoa. I am a Software Engineer by profession (means I have to see screen almost 10-14 hours a day) and My Eye vision is working perfectly. I think, I have two issues with my eyes. First is my eye vision become blurry during book reading or at that time when clear focusing on anything. and second is, when I yawn, my eyes become stretch and water comes in my eyes. Please give me your valuable suggestion or recommendation.

Thanks