Laser Vision Correction

Dr. Snyder is committed to providing you with the best possible outcome and the least possible risk, so you can achieve the highest quality of visual performance without relying on glasses or contacts.

The Process
We provide complimentary screening where we will check your refractive error, measure your pupil size, and obtain a topographic map and thickness profile of your cornea.  You will then meet with one of our eye surgeons to assess your visual needs and desires, identify any potential risk factors for surgery, and collect valuable data that allows us to choose the appropriate procedure for you.  If you are a potential candidate for laser vision correction, you will be scheduled for a comprehensive evaluation with Dr. Snyder.

comprehensive medical evaluation will be necessary to confirm your suitability for laser vision correction and includes: CustomVue Wavescan assessment to map higher order corneal aberrations to provide a custom treatment if applicable,  a thorough undilated and dilated refraction, and a complete ophthalmic dilated eye exam.  At the conclusion of the evaluation, Dr. Snyder will review your case and suitability for refractive surgery.

You will need to be out of your contact lenses for this exam for at least two weeks for soft lenses or be re-checked once out of your contact lenses before we can perform any surgery.

If measurements are appropriate, Dr. Snyder will provide a thorough discussion of the risks and potential for a good outcome, and present to you what we believe are your best options.

Expected Costs:

Laser Vision Correction Screening:  Complimentary  

Laser Vision Correction Comprehensive Evaluation: $199

The Procedure
Myopic Cornea vs Normal CorneaIn order to understand refractive eye surgery, it is essential to understand how the eye works.

Think of the eye as a camera. Light rays that come into a camera must be focused on the film. So it is with the eye. The cornea, like the lens of the camera, focuses the incoming light rays.

The human crystalline lens is behind the iris and adjusts the focus for distance or near vision.

The light rays are sharply focused on the retina, like the film of the camera.

Approximately 60% of the focusing power occurs on the cornea.

In people with myopia, we can think of the cornea as being too powerful for the length of the eye and light rays are focused in front of the retina.

Understanding LasikIn order to correct myopia, we use the laser to alter the shape of the cornea, reducing its power, and allowing the light rays to be focused on the retina.

This is done by removing a precise amount of tissue with the laser.

The pattern of tissue removal is such that it “flattens” the cornea and reduces the effective power of the cornea.

Anatomy

The cornea works like a simple lens.

Light rays strike the surface and the change of index of refraction causes the bright rays to be bent toward the surface normally (a line perpendicular to the corneal surface).

the CorneaThe epithelial cells make up the smooth optical surface and are very active in replicating and moving to constantly remodel and provide a smooth surface.

Alterations of the epithelium are not permanent or long standing since the tissue will quickly remodel and heal to resume its smooth contour.

The epithelial shape will, however, reflect the surface curvature of the underlying cornea stroma.

The cornea stroma is made up of collagen fibrils that are arranged as overlapping sheets of tissue.

Each sheet is separated by approximately half the wavelength of light and, thus, remains optically clear, transmitting and not scattering light.

The underlying endothelial cells control the relative water content of the overlying cornea stroma and maintain approximately 78% water content.

This assures the appropriate separation of the collagen sheets so they transmit light rather than scatter the light (as seen in a cornea scar).

The strategy for laser vision correction is to remove or displace the surface epithelium and expose the underlying cornea basement membrane or stroma, so that the laser treatment can cause a permanent alteration to the corneal shape.

RefractionSince the cornea stroma will not remodel itself in most cases, the alteration in its shape or contour will be permanent.

When the epithelium grows back or the flap with epithelium is repositioned, it will “take on” the shape of the underlying stroma as it remodels and allow a new “optically correct” corneal power to occur following the laser treatment.

> Learn more about Lasik