LASIK for the Correction of Myopia, Hyperopia and Astigmatism
 
How do Myopia, Hyperopia and Astigmatism differ?
 
 

In the normal eye emmetropic eye, rays are bent by the cornea and the lens to focus on the retina.  Myopia (nearsightedness), Hyperopia (farsightedness) and Astigmatism are conditions where rays of light do not focus on the retina and contact lenses or glasses are required. LASIK or PRK Surgery reshapes the cornea and reduces or eliminates the need for prosthetic optical devices is the condition where light rays focus in front of the retina. The LASIK Surgery Video Informed Consent can be found here and the associated pdf file here. Custom ablation using the iDesign CustomVue and the VISX S4 Excimer Laser is discussed here.

Myopia

Light rays focus in front of the retina The Myopic eye can see at near not at distance Laser surgery flattens the cornea

Hyperopia

Light rays focus behind the retina The Hyperopic eye can see at distance not near Laser surgery steepens the cornea

Astigmatism

Two planes of light 90 degrees apart straddle the retina The Astigmatic eye is often blurry at distance and at near Laser surgery converts a football shaped cornea into a more spherical shape

Lasik Surgery - Stage I - Preparation

The cornea is prepared for the flap Using a microkeratome, the flap is created The flap is fully opened in preparation for the excimer laser

Lasik Surgery - Stage II - Ablation

Myopia ablation flattens the central cornea Hyperopic ablation results in a steepening of the central cornea Astigmatic ablation achieves a more spherical cornea

After Laser Ablation

The flap is repositioned. Excellent acuity is usually achieved by the following day.


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