Methods, apparatus, and computer-readable media are provided for ensuring compatibility between an operating system and a BIOS redirection component. The control device sets the opening area of the aperture to an opened observing opening area when observing the fundus oculi, and to a narrowed photographing opening area when photographing the image of the fundus oculi. The dosing or flow rate varies as a function of tool stress which can include use intensity andor temperature. Due to the speed of operation, the end effector may build up excessive electrostatic charge.