Parkinson's disease is a gradually progressive disease that affects a little region of cells within the mid-brain known as the substantia nigra. Gradual degeneration of these cells causes a reduction in a vital chemical neurotransmitter, dopamine. The decrease in dopamine results in a single or more of the traditional signs of Parkinson's disease that includes: resting tremor on one side of your body; generalized slowness of motion; stiffness of limbs; and gait or balance complications. The cause of the condition is unknown. Both genetic and environmental factors behind the disease have already been postulated. Parkinson's disease affects about 1.2 million individuals in the United Claims and Canada.TheBiotrueONEday for Presbyopia contacts combine the breakthrough bio-motivated materialHyperGel™ ofBiotrueONEday contacts, with Bausch + Lomb’s3-Zone Progressive™ optical style used inPureVision®2 multi-focal contacts for Presbyopia, and so are the 1st daily disposable multifocal lens from theBiotrue® ONEday category of items. I’m very happy to have theBiotrueONEday for Presbyopia contacts in the expanded low combine power ranges, therefore i can offer more of my individuals a daily disposable lens choice with advanced multi-focal technology, said David Geffen, O.D., from La Jolla, Ca.