There are approximately 120 to 130 million rods in each eye and approximately 6.5 to 7 million cones. (http://www.tedmontgomery.com/the_eye/). This transfer occurs by the means of the optic nerve. It is actually the brain that translates these messages into images. (http://www.tedmontgomery.com/the_eye/) The brain is the translator and the eye is actually the image collector.
The important ability to focus the light on the retina is dependent upon many factors. First, it is dependent upon the shape of the cornea and lens and its stretchiness and elasticity. Second, it is dependent upon the shape of the eyeball. Finally, it is also dependent upon the muscles attached to the eye. The muscles are important because they change the shape of the lens systems and work to keep the object focused on the retina. This is ultimately controlled by the nervous system. (Freudenrich)
LASIK uses an automated instrument that creates a "thin protective layer of corneal tissue that covers the area to be sculpted by the laser." (http://www.bgsm.edu/eye/cornea/lasik1.htm) Then, another laser sculpts the underlying cornea and corrects the refractive layer. (http://www.bgsm.edu/eye/cornea/lasik1.htm).
LASIK is an effective quite successful procedure. Research shows that surgeons aim for 20/20 vision, although it does not guarantee it. (http://www.lasikinstitute.org/Expectations.html) It is aimed at correcting refractive errors: myopia, hyperopia and astigmatism.(http://www.lasikinstitute.org/Refractive.html) It is successful because research shows that in "4800 cases, less than 1% experienced intra-operative complications" and "post-operatively, 7.98%." (http://www.lasikinstitute.org/RisksnComplications.html)
The risk of complications might deter some from choosing LASIK over more conventional types of corrections. However, the only thing that might deter me would be the cost. Contacts and glasses are inconvenient.