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.

Streaming the Blues

By | August 11, 2016|

Your eyes, in combination with your brain, can see and understand light waves by interpreting them as color. Reds are longer wavelengths while blue and violet are shorter. Light is energy emanated in electromagnetic waves which are measured in nanometers (nm) or billionths of a meter. The longest electromagnetic wavelength that a human can see […]

Myopia Epidemic, Worldwide

By | October 15, 2015|

Throughout the world there is an epidemic of myopia (nearsightedness).

According to Dr. Jeffery Cooper, a myopia researcher, in the early 1970s there was about 25% myopia among U.S. young adults. Compare that to 41% in 2004. Genetics cannot explain such a change!

Taiwan is now 80% myopic. In South Korea in 1955 myopia affected 18%. In […]

Dry Eye Syndrome: Introduction

By | April 20, 2015|

At one time we eye people worried about making thinner lenses for high prescription glasses. Later we fretted over the rising incidents of cataracts and eye disease in our aging American population. Then we agonized over LASIK. Currently the nagging conundrum is chronically uncomfortable eyes – inappropriately labeled dry eye when what’s really meant is […]

Macular Pucker

By | February 2, 2015|

Macular pucker is a protracted visceral stress condition common to bungee jumpers.

Sorry, just kidding.

Macular pucker is actually an eye disorder – an anomalous facet of a normal happening.

When we are born the inside filling of our eyes is a clear but firm jelly called the vitreous. The vitreous is contained in a membrane which adheres […]

Age Related Eye Disease Study (AREDS) 2

By | June 16, 2014|

Just as with AREDS, I believe AREDS 2 has a multitude of problems. Instead of studying just one or two variables the study has as many as six. Then it is stated over and over again within the abstract, methods and results that there is no true placebo group. Why not simplify the project so […]

Migraines and Vision

By | February 10, 2014|

You’re feeling a little strange, and something is funny about your vision. Well, funny only if you have a bad sense of humor.

At ten minutes you postpone a run for groceries because … well you’re just not seeing well. Maybe you should take a break. You reach for the morning paper. You can’t quite catch […]

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 […]