Abstract: A handle for a diagnostic instrument includes a battery housing for retaining at least one rechargeable battery and a set of interchangeable adapters which can be selectively and releasably engaged with the housing to allow recharging of the battery through interconnection with an external power source, such as a wall outlet. The adapters are directly attached and detached to one end of the battery housing without requiring any disassembly or modification of the battery housing, allowing the instrument to be used either with or without an attached adapter.

Abstract: In an eye test apparatus of the type having a single examination area, an improved view port is disclosed having a view port casing and a mounting apparatus arranged so that the view port casing is movable between a first and second active positions. In a first active position, the casing receives a patient's forehead so that a patient's right eye is aligned with a examination area, and a second active position wherein a casing receives a patient's forehead so that a patient's left eye is aligned with the examination area. The casing is specially configured to occlude ambient light and to accommodate a patient wearing eyeglasses. The eye test apparatus may further have a position sensor system for sending the present position of the casing.