How LASIK Improves Vision

Laser Vision Correction is exciting and most people think about having it done for a long time before they actually make their appointment for a consultation. Questions are common. The most common concerns that people have are questions like, “Will it hurt?”, and, “Is laser vision correction safe?” Others may ask, “Is it affordable for me?” or “Is it going to work?”

At King LASIK, our goal is to answer all your questions to help you make the right decision if laser vision correction is right for you. We are proud of our care and we do our best to help our patients to feel comfortable with the entire process. Dr. King has been performing laser vision correction for more than 16 years and has performed more than 85,000 procedures, but we know that each patient has questions, individual lifestyles and concerns. We will do our best to help you make the right choice for you. We look forward to meeting you.

Anatomy of the Human Eye

The human eye has three key areas that help to focus light. First is the air-tear film interface. Just as light is bent as it may emerge from or enter into a swimming pool, much of the eye’s focusing takes place at the air-tear film junction where a difference in density leads to a change in light direction. Second, the cornea (the clear front layer of the eye) also bends the light rays, and the curvature of the cornea is a key determinant of how much the cornea will focus. Finally, the lens in the eye also focusses light and it is the change in shape of the lens that may allow us to change our focus from distance to near. With LASIK or PRK, we change the shape of the cornea and this can precisely improve the vision, to change the focusing of the cornea so that the entering light rays are focused precisely on the retina.


With myopia or nearsightedness, the cornea may bend the light rays excessively and the light rays are in focus in front of the retina. Another way to think of it is that the eye is too long for the focusing power of the cornea. We cannot change the length of the eye, but with LASIK or PRK, we can flatten the cornea and reduce the bending that takes place there, effectively focusing light on the retina.


With farsightedness, the cornea does not bend the light rays enough and the entering light rays are still out of focus as they strike the retina (as they head toward a theoretical focal point behind the eye).


With astigmatism, the cornea may be misshapen and light rays may be bent differently at one point in the cornea compared to another. For example, an astigmatic cornea may be football shaped, rather than round like a basketball.

Schedule a Consultation

LASIK and PRK are advanced laser vision correction procedures that can correct a number of vision issues. If you have been considering laser eye surgery and would like to learn more about which procedure is right for you, contact Dr. Joseph King’s Bellevue LASIK office today at 425-525-1000.