Eye strain always occured due to extended use of the eyes. However, even though your eyes feel unconfortable because of eye strain, it will not cause you serious eye damage. However, there are some other eye conditions which can cause headaches such as glaucoma or cataracts.
With glaucoma, pressure builds up inside the eye due to its inability to drain fluid properly. That eventually can damage the optic nerve. Open-angle glaucoma, which is a slow buildup of pressure, may not have any symptoms, but angle closure glaucoma, which causes a sharper increase of pressure, can cause pain blurred vision and headaches.
Cataracts, a clouding of the eye’s lens, also can bring about headaches as they become more severe. As your vision becomes more limited, the eye works harder.
So as to the headaches from eye strain, you do not worry about that. If your eye stain just caused by the prolonged computer uese, you could buy a pair of eye strain glasses to protect your eyes from the light refecting from the computer screen.