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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 Lenses: An Introduction

By | January 6, 2014|

Old studies from the 80s showed that in the United States the percentage of soft contact wearers to firm contact lenses wearers was 80% to 20% – Europe showing almost the opposite percentages. A recent study from Optometric Management suggests it is now more like 94% to 6%, and apparently Europe is similar.

Since I […]

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 […]

LASIK, Getting Rid of Glasses and Contact Lenses

By | March 19, 2013|

Every year many who need glasses or contact lenses opt for LASIK, but LASIK is only one of many refractive surgeries:

1. RK – Radial keratotomy
2. CK – Conductive keratoplasty
3. Intacs – Intrastromal rings
4. RL – Refractive lensectomy
5. ICL – Implantable contact lens
6. LASIK – Laser-Assisted in Situ Keratomileusis
7. PRK –Photorefractive keratectomy

This list incorporates all the […]