Cornea Tough, transparent covering over the front part of the eye. Convex in shape. Refracts light as it enters the eye (by a fixed amount). Iris Coloured part of the eye that contains muscles.

An curved arrow pointing right. Ever wonder how surgeons perform the surgery that can improve a person's vision? This animation shows how LASIK reshapes the cornea, improving the patient's vision ...

the lens being too thick and curved - so that light is focused in ... laser surgery to change the shape of the cornea and a replacement lens in the eye. Contact lenses work by being in ‘contact ...