Normal Eye
Clear vision is the result of light entering the cornea (outer window of the eye), passing through the lens (behind the iris), and focusing directly on the retina, at the back of the eye.
Nearsightedness (Myopia)
If the cornea is too steep or the eye is too long, the laser must remove tissue from the center of the cornea to reduce its focusing power. This moves the point of focus from in front of the retina to on the retina.
Astigmatism
Cornea is the clear dome in front of the eye and in a perfect world, it would be a perfect half sphere. But, if the cornea is more curved in one direction than the other, similar to a half football, 
the laser must remove tissue so that the cornea is more symmetrical, 
so that is more perfectly spherical similar to a basketball. This eliminate multiple focal point and establishes one point of focus on the retina.
Farsightedness (Hyperopia)
If the cornea is too flat or the eye is too short, the laser must remove tissue from the outer zone of the cornea to make it steeper and increase its focusing power. This moves the point of focus from behind the retina to on the retina.
Presbyopia
Is a natural, normal process that at near age 45, one's ability to change the focus of the natural lens inside the eye is diminished. Most people will notice that holding object further by stretching their arms longer helps. Ultimately, the reading glasses or bifocal will become necessary to help with reading at near.
Monovision
Monovision is a method chosen by patient with presbyopia where one eye is set to focus at near and one eye to focus at distance. When both eyes are open, one is able to see both far and near. Initially most patient may find the concept strange and reject the idea, however, monovision tends to be either loved or hated by most people and unless tried in contact lenses, one will not know for certain.
Contact us today to schedule a consultation!
The physicians of Northern California Laser Center are renowned Modesto and Stockton lasik eye surgeons. They are also considered Modesto and Stockton cataract surgery specialists. These physicians treat LASIK Modesto and cataracts patients from their Modesto offices.
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