Get your vision tested...Most probably you need glasses ....Even if power is fine...Still would suggest to take anti glare specks and use it while working on computers

You could be straining your eyes. Please do the following: 1. Get an eye check up done, see if you need spectacles 2. Do not see screen for too long, few minutes of break every hour is a must 3. Practice the near far vision exercise 4. Work at an optimum distance, brightness and contrast Overall see if cutting your screen time can help, if you still get headaches then consult a doctor.

Start wearing an antiglare specs, it helps filter out the glare which can cause head ache. The distance between your screen and your eyes should be more than 30 cm. Its also important you get your eyes checked. You might need specs.

Suggest you to get eyesight checked up