The natural lens is suspended within the eye by elastic fibres around its circumference. These, and the lens capsule are retained during the cataract surgery to allow the lens implant to be supported in the position that the original lens occupied.
The idea that individuals with a particular disease process will not each experience the same severity of disease. For instance, one person may have a milder form of the disease while another person with the same disease has a more severe manifestation of the disease. This is in contrast to incomplete penetrance.
A protein which induces the growth of new blood vessels and is usually produced in response to impaired oxygen flow to tissues. It may be produced in increased quantity in diabetic retinopathy and age-related macular degeneration.