You doze off at your computer

The muscles in your eyes work hardest when you focus on close-up or detailed work, like when you’re reading or working at the computer. If your near vision is poor, those muscles work even harder to help you see clearly. Because that isn’t a natural position for the eyes, they can get tired, which makes you feel sleepy. If reading glasses alone don’t help, try blinking more often or pushing your computer further away from you. This will help to relax your eyes.
And if that doesn’t do the trick, try these other simple ways to revive tired eyes.
You need brighter light to read

Your normal reading lamp doesn’t seem bright enough, so you turn on another lamp, and then maybe even an overhead light. If you never seem to have enough light, regardless of the room or type of lighting, it could be one of the signs you need glasses. This becomes more prevalent as you age, but don’t worry – it’s a normal condition. Studies show that the average 60-year-old needs at least three times the amount of light as a 20-year-old.
You get an arm workout while reading

The way you hold a book can be one of the most telling signs you need glasses. If you are near-sighted – which is when you can see close up but not far away – you’ll bring a book 30cm or less towards your face. If you’re far-sighted – which is when you can’t see up close – you might need to hold the book at arm’s length. Remember this rule: if an object held 35cm from your face is blurry, you may need some sort of corrective lens.
Now discover 13 eye care tips your optometrist wishes you knew.