Aspheric Contact Lenses Correct Two Different Vision Problems

Aspheric contact lenses, sometimes called multifocal contacts, help the depth of focus of the eye. People who have early stages of astigmatism and presbyopia can benefit most from using these contact lenses. Aspheric lenses help moderate astigmatism since they do not conform to the cornea as a gas permeable lens does.

People who have reached their 40's sometimes need to use a contact lens with aspherical qualities. That age bracket often notices signs of blurred vision, even when they have never had vision problems before. The two problems that aspheric lenses correct, astigmatism and presbyopia, are very common.

Astigmatism is when the cornea is curved in an unusual way causing light to be bent out of focus. It is often associated with nearsightedness or farsightedness.

Presbyopia is when the eye has difficulties expanding or contracting to focus on close objects. 90 million people in the United States may have signs of this disorder. It is believed to be a gradual loss of flexibility in the natural lens inside the eye. It is not nearsightedness or farsightedness, though the symptoms are similar. This is a very treatable condition, often using aspherical contacts to correct the focusing problems.

Some contacts are designed to help those with presbyopia in a unique way. Both lenses are different but work together to provide clear vision for both near and far away. The D lens serves the dominant eye and the N lens works for the non-dominant eye. This balanced approach allows the eyes to function normally and the lenses aid more than actually correct vision problems. Such name brand lenses as Frequency 55 and Biomedics 55 are disposable aspheric lenses that correct the eye's focusing abilities.