accommodating lens implant: a lens implant containing a hinge that allows for both near and far vision (thus mimicking the natural lens of a young person)
lens implant: a clear plastic lens that is implanted in the eye; usually done when the natural lens has been removed in a cataract operation
pyramidal tract: any of the important motor nerves on each side of the central nervous system that run from the sensorimotor areas of the cortex through the brainstem to motor neurons of the cranial nerve nuclei and the ventral root of the spinal cord