Dr. David

>Dr. David

About Dr. David

Dr. Dan David received his Doctor of Optometry degree in 1978. He has been in private practice ever since, and has lived in Pullman since 1986. A Board Certified thirty-year member of the American Optometric Association, a fellow of the Academy of Optometry and the American Board of Clinic Optometry he has written several professional articles on eye care.

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 […]

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 […]

Sunglasses, Part 2

By | June 26, 2013|

The American sunglass industry has done a good job of regulating itself, although some of their advertising is a bit grandiose. Still the sunglass industry has not stepped beyond those claims made by plenty of other industries.

In this article I address how sunglasses can help with reflections. Some sunglass producers tout elimination of 100% of […]

Sunglasses, Part 1

By | June 25, 2013|

The American sunglass industry has done a good job of regulating itself. The world has followed. The industry has seen to the use of good science, but it is appropriate to know which claims of superiority have validity and which are shaded distortions, pun intended.

Let’s start by considering the UV filtration aspect of sunglasses.
The prefix […]

Choosing the Best Sunglasses

By | May 1, 2013|

How do you find good sunglasses? “The answer lies within you.” It smacks of the incantation of shaman doesn’t it? With sunglasses the answer fits like that T-shirt with the logo of your favorite ball team.

Mountain bikers want wrapping glasses that stick like glue and feel like silk, no backside reflection, no fogging, and sun […]

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 […]

High Definition Eyeglasses

By | April 26, 2013|

This science improves vision for everyone, but is most impressive to those of us with complex prescriptions and/or progressive no-line bifocals. Still, if you are a glasses wearer you might be surprised by the intensity of vision available in high definition glasses regardless of your optical prescription.

Why was this science instigated? LASIK. What does LASIK […]

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. […]