Astigmatism is a refractive error usually caused by an irregular curvature on the surface of the eye. As light enters the eye it is focused on two points instead of a single point needed for clear vision. Normally the curve on the surface of the eye is equal from left to right and from top to bottom, giving the surface of the eye an equally round shape like a ball.

With astigmatism one of these curves is elongated making the surface of the eye oval shaped. This could, for instance, cause the light being refracted by the horizontal axis of the cornea to focus on a different point than the light being refracted by the vertical axis.

This causes two points of focus instead of one. If the points are focused before the retina the astigmatism is considered nearsighted or myoptic. If the points are focused past the retina it is considered farsighted or hyperoptic.

Symptoms of astigmatism include headaches, eye strain and fatigue. Severe astigmatism can cause a blurriness of images at all distances, while milder cases may cause blurriness only at certain distances. If you suspect you are suffering from astigmatism, ask your doctor for advice. Successful corrective measures include contact lens or refractive surgery.

Computer Vision Syndrome, or CVS, is characterized by tired and sore eyes, headaches, neck and shoulder pain and general body fatigue. It is the number 1 complaint in the workplace and affects everyone who works on a computer.

CVS is brought on by the way the computer screen works. An image on the screen is made up of thousands of tiny colored squares called pixels. These pixels are constantly changing in color and brightness which causes your eyes to refocus. This constant refocusing is what causes the systems of computer vision syndrome.

The only sure fire method to prevent CVS is to wear specialty prescribed computer glasses. These can range from specialized multi-focal lenses to single focal lenses used specifically uses while using the computer.

However, you can also combat the effects of CVS simply by setting up your workspace. Place your computer screen approximately 20 to 40 inches away from your eyes, directly in front of you and position it so there is little to no glare on the screen. Make sure the screen height is setup properly so it can be viewed without looking down or slouching in your chair. Finally a desk lamp maybe used to provide more light without increasing glare.

While proper arrangement of your workspace will help reduce the effects of CVS, you should consult your eye care provider to fully prevent CVS.