Abstract: A computer input device (10), typically a mouse, having a body (12) with a generally planar base (14) for resting on a work surface, the body (12) being elongate in a direction extending away from the base and having a thumb support ledge (41) defining a thumb surface (40) for engagement by only the tip of a thumb (60) of a user and an opposed finger surface (42, 44) for engagement by only the tip of one or more fingers (62, 64) of the user, wherein the thumb support ledge (41) is located a distance in the range 15 to 30 mm above the base, with the spacing between the thumb surface (40) and the finger surface (42, 44) being in the range 8 to 40 mm. The body (12) is preferably symmetrical about a plane perpendicular to the base (14) so that the device (10) can be held either by a right hand (58) or left hand of the user.

Abstract: A computer input device (10), typically a mouse, having a body (12) with a generally planar base (14) for resting on a work surface, the body (12) being elongate in a direction extending away from the base and having a thumb support ledge (41) defining a thumb surface (40) for engagement by only the tip of a thumb (60) of a user and an opposed finger surface (42, 44) for engagement by only the tip of one or more fingers (62, 64) of the user, wherein the thumb support ledge (41) is located a distance in the range 15 to 30 mm above the base, with the spacing between the thumb surface (40) and the finger surface (42, 44) being in the range 8 to 40 mm. The body (12) is preferably symmetrical about a plane perpendicular to the base (14) so that the device (10) can be held either by a right hand (58) or left hand of the user.