Although the following exercises were originally advised for people in veterinary services (specially surgeons, for the the dexterity of hands and fingers is important; these are equally good for peoples with Parkinson's :
To increase the range of movement, close both hands into tight fists, hold the position for approximately 1 minute and then open and spread your fingers as much as you can. Repeat the cycle 3 to 5 times for each hand.
To increase the thumb’s strength, extend your hands in front of you, palms down, and, keeping your thumbs stretched to the side, close the remaining fingers. Then flex your thumbs over the other fingers until you touch the little fingers and hold the position for a few seconds before slowly returning to the starting position. Repeat the cycle 3 to 5 times for each hand.
To increase the dexterity of your fingers, place your hands on a flat surface with your palms facing down and lift and lower each finger sequentially, beginning with the index finger and then reversing the direction. Repeat several times a day and increase speed.
To increase eye-to-hand coordination, place your hands on a flat surface with your palms facing up and join the tips of your thumbs with your index fingers, forming an “O”, without raising your other fingers. Return to the starting position and repeat with the remaining fingers. Repeat the exercise several times and increase the speed sequentially.
To increase hand strength and the ability to hold objects for long periods of time, squeeze an anti-stress ball with your maximum strength without causing discomfort, hold the position for about 5 seconds and then relax the hold. Repeat the exercise 10 times every 3 days.
Other activities that help improve manual dexterity and hand-eye coordination include playing video games, juggling and writing on keyboards!
Source:
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