Astigmatism is a common vision problem that often can be corrected with Biomedics toric contact lenses. A slightly misshapen cornea is usually the cause and the result is a distortion of vision. Astigmatism correction requires custom-made lenses with a precise fit. Biomedics toric contact lenses were specially created to maintain a precise fit despite eye movements which cause them to shift.

To understand the reason for the design of Biomedics toric contact lenses, it helps to understand what astigmatism is. Astigmatism is distorted sight caused by a non-spherical cornea or sometimes the lens. The cornea is clear tissue that covers the front part of your eye. A normal eye is shaped like a ball and the cornea is rounded evenly in all directions. But an astigmatic cornea isn't rounded evenly in all directions. This unevenness causes objects to look distorted but like other vision problems, it is correctable.

After your eye is measured, it's not difficult to make a contact lens that will correct for astigmatism. The difficulty comes in maintaining the same fit. Because a normal eye is evenly rounded, it doesn't matter if the contact lens rotates or offsets slightly. But in order to function properly, a contact lens that corrects for astigmatism must somehow maintain itself in the same position. And the design of Biomedics toric contact lenses achieved this stability plus the awarding of a patent for its uniqueness.

Every time a person wearing contact lenses blinks, it tends to move the contacts. To keep this from affecting wearers of Biomedics toric contact lenses, the lenses have a shape which puts more weight at the bottom of the lens. So when the lens is shifted, the uneven weight of the lens tends to make it right itself.

This self-righting feature is all the more remarkable because Biomedics toric contact lenses are soft contacts. Since soft lenses are subject to having their shape altered slightly when worn, it's not easy to design effective soft toric lenses. But the Biomedics contacts provide effective correction while providing the comfort of soft lenses.