Hard Contact Lenses

>Hard 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 […]

RGP Contact Lenses – What Are They?

By | December 20, 2013|

What are Rigid Gas Permeable Contact Lenses?

The first contact lenses were made from the acrylic (plastic) known as polymethyl methacrylate (PMMA) or Plexiglas.

Back then the science of plastics was on the move as acrylic polymers were manipulated by crosslinking carbon chains with various elements like fluorine and silicone improving the amount of gases, oxygen being […]

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 […]