When you undergo cataract surgery, Dr. Croley removes the natural lens of your eye. This is done because cataracts are clumps of protein that have developed within the lens. Your intraocular lens takes over for the natural lens, fulfilling three important functions. The lens in each of your eyes, along with the cornea, must be completely clear in order for light to pass through to the retina. The transference of light rays onto this piece of tissue at the back of the eye is what forms vision. The lens also provides the necessary structure for the vitreous gel that fills the center of the eye. Finally, and where we customize your lens, the IOL provides focusing power so you can see clearly. It's not possible to see clearly, nor to preserve healthy eyes, without replacing the cataract-ridden lens. Fortunately, because IOLs are very thin, you won't even notice that you have an artificial structure in place of your old, clouded lens.