Dr. Dan David

>Dr. Dan David

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 […]

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 […]

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, 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 […]

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 […]