Toric Contact Lenses

>Toric Contact Lenses

Contact Lenses and Astigmatism, Can They Be Mixed?

By | February 5, 2014|

When soft contact lenses emerged, only firm lenses could correct astigmatism. If you had less than 1.00 unit (units are “diopters”) of astigmatism it was frequently ignored with fairly good success. This is still true, and many doctors never discuss low astigmatism when they find it in their contact lens patients.

Most soft contact lenses are […]

Contact Lens Prescriptions

By | April 16, 2013|

Contact lenses are either a Class II or Class III medical devices, and like Valium they require a prescription. Also like Valium if you abuse them they can cause problems.

In many states the length of validity for prescriptions is left to the discretion of the doctor. In the State of Washington it is also […]

Contact Lens Materials

By | April 15, 2013|

 

Firm Contact Lenses

The original contacts were hard lenses made out of polymethyl-methacrylate (PMMA) or Plexiglas. A Royal Air Force pilot was hit in the face by debris from the Plexiglas windshield of his fighter plane. Particles of PMMA remained in his eye with no problems, so it was a good place to begin contact lenses.

PMMA […]