How to protect my eyes when I have to stare at my computer screen for longer than 10 hours every day?
Your eyes are not designed to stare at one thing in front of you for many hours. Here are several ways to protect your eyes:
1. The 20/20/20 rule
For every 20 minutes looking at the screen, look at something else at least 20 feet, or 6 meters away for 20 seconds. Set a timer to remind yourself if necessary.
2. Blink more
It's often ignored that you are likely to blink less when looking at the screen, causing dryness and irritation. A solution is to blink 10 times every 20 minutes, and artificial tears can also relieve the dryness.
3. Adjust lighting and position
Adjusting the brightness of your screen to match the level of light in your workplace can reduce eyestrain. If the screen has a lot of glare, try adjusting the lighting or using a matte screen filter. 
The position of the screen also matters. A good rule is to sit about at arm's length away from the screen, and position the screen so the eyes gaze slightly downward.
4. Screen and filter
LCD screens have a blue light emission, which has probable damage to eye health. Some screens have an adjustable color temperature to reduce the emission, or you can apply a blue light screen filter.
Some people are more sensitive to PWM flicker of the screen, and should check the product information before purchasing. The flicker is also harder to perceive at higher brightness settings.
Are blue light blocking glasses also effective?
There is no scientific research to prove that blue light can damage the eyes or have other health effects. Likewise, there is no evidence that blue light glasses can reduce symptoms associated with looking at a digital screen for long periods. You're better off using the 20-20-20 rule, which involves looking away from the screen to an object at least 20 feet (6 meters) away for 20 seconds every 20 minutes, to give the eyes a break.