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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 […]

Steroids for Your Eyes

By | April 29, 2013|

The original corticosteroid was isolated in the 1950s for which a Nobel Prize was awarded. That steroid is known as cortisol or hydrocortisone. All the drugs used on the eyes are synthetic variants of cortisol, although a fanatic chemist might disagree slightly. Steroids are hormones having a unique chemical structure. In fact cholesterol is a […]

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 […]

Latisse and Making Prettier Lashes

By | April 6, 2013|

Here is my take on using Latisse:

Latisse is the glaucoma drug bimatoprost. Besides controlling eye pressures, bimatoprost stimulates the eyelash follicles to grow lashes as well as adding some pigment and thickness. It is a nice effect.

There is also some evidence that Latisse and similar prostaglandin analogs darken the skin. So you should avoid getting […]

LASIK and Life

By | March 19, 2013|

Sometimes called flap-and-zap, LASIK is a computer numeric controlled process incorporating the excimer laser, an ultraviolet laser. With only a ten degree change in tissue temperature, the excimer removes corneal tissue like the vanishing coin in a magician’s hand. Now you see it. Now you don’t. It is a truly miraculous evaporation process called ablation. […]

Glasses That Change Color

By | March 19, 2013|

In the 1940’s Corning Glass Company started experimenting with glass that changed color when exposed to certain kinds of light. This was the beginning of the technology of photochromics.

In 1962 Corning made commercially available Photogray glass by putting silver halide crystals into molten glass. Silver halide is the chromophore or the chemical that makes it […]

Vitamins, Supplements & AREDS

By | March 19, 2013|

Makers of products with names like MiteHeeMan and SitePerfecto are not only convincing athletes and sportsmen of better golf scores, sex lives, and poker earnings, they are persuading archers and marksman they can see a fly on a fence post at fifty yards in foggy furrow. Everyone needs daily minimums of vitamins and minerals, but optimal doses are unknown. […]

Eclipses, the Dark Side

By | March 19, 2013|

If peered at long enough a bright light can cause damage to the nerve tissue layer that forms the inside lining of the back wall of the eye. This clear layer is known as the retina. It’s that which stands between us and blindness. The human eye concentrates light and heat about the same as […]

Evolution of Sunglasses

By | March 19, 2013|

Primitive societies reduced the harmful effects of excessive sun with various adaptations of slits or holes in leather, sea shells, ivory etc. These poor souls striving simply for survival with no pretensions paid no mind to appearances and may have had it more correct than we do.

The first sunglasses as we know them were originally […]