Dec 21, 2014 - 11:57 AM
Depending on your dad's unique situation, it may be helpful to purchase a track-ball mouse as opposed to a standard infrared. Larger track balls can be used with multiple parts of the hand and remain stationary, allowing your dad to take more time to use the area of his hand he is most comfortable with. Also search for a mouse that has the largest buttons available for the same reasons. It may also be helpful to turn down the speed of the cursor, click and scroll so that less dexterity is needed to navigate on screen.
Source: Personal Experience