To avoid neck strain, the top of your computer monitor should be at eye level, about an arm’s length away. Our eyes naturally look about 15 degrees down and so will then naturally look onto the screen.
There are various bits of equipment that you can buy to raise the screen but a cheap and cheerful option is to prop it up on some large books.
For laptops, it’s a different scenario as the screen is invariably too low and may even be a little close. This is fine if only using the laptops for short periods of time. If you are using a laptop a lot and don’t need it to be too portable, you can buy a separate keyboard and mouse. Ideally, the keyboard should be a “low profile” keyboard – one that is fairly flat. You can then prop the laptop up, an arm’s length away, with the top of the monitor at eye level. There are different types of kit available for this including ones that are like cookery book holders and others that are like bean bags. But, once again, you can always prop the laptop up on some large books.
Posturally, it is not good to push your head and neck forward to read the screen. This can cause neck pain, back and shoulder strain. It’s worth getting your eyes tested regularly to ensure you can see clearly. You can also look at getting a larger screen or adjusting the print size on screen. But also trust your eyes as pushing the head forward may just be an unnecessary habit.
So as well as thinking about your computer set up, think about your body and how you use it.