A system for indirectly determining weight on eye, comprising: a docking apparatus; a measuring device operable to detect a detectable position of a component of the docking apparatus and generate data relating to the detectable position; a force sensor operable to sense a sensed force; a display ; and a processor operable to: receive data from the measuring device relating to the detectable position; determine a relative distance between the detectable position of the component in relation to a neutral position of the eye , wherein the neutral position of the eye is a position in which the eye is in contact with the component, with a substantially neutral pulling or pushing force on the eye based on the contact; determine weight on eye resulting from contact between the docking apparatus and the eye by reference to sensed force-distance reference data; generate a pictorial representation of the weight on the in eye in relation to the detectable position; and transmit the pictorial representation to the display , wherein the force sensor is operable to generate data relating to the sensed forced that corresponds to weight on eye, and the processor is configured to receive data from the force sensor and the measuring device and to generate the sensed force-distance reference data by correlating weight on eye to the relative distance. a docking apparatus; a measuring device operable to detect a detectable position of a component of the docking apparatus and generate data relating to the detectable position; a force sensor operable to sense a sensed force; a display ; and a processor operable to: receive data from the measuring device relating to the detectable position; determine a relative distance between the detectable position of the component in relation to a neutral position of the eye , wherein the neutral position of the eye is a position in which the eye is in contact with the component, with a substantially neutral pulling or pushing force on the eye based on the contact; determine weight on eye resulting from contact between the docking apparatus and the eye by reference to sensed force-distance reference data; generate a pictorial representation of the weight on the in eye in relation to the detectable position; and receive data from the measuring device relating to the detectable position; determine a relative distance between the detectable position of the component in relation to a neutral position of the eye , wherein the neutral position of the eye is a position in which the eye is in contact with the component, with a substantially neutral pulling or pushing force on the eye based on the contact; determine weight on eye resulting from contact between the docking apparatus and the eye by reference to sensed force-distance reference data; generate a pictorial representation of the weight on the in eye in relation to the detectable position; and transmit the pictorial representation to the display , wherein the force sensor is operable to generate data relating to the sensed forced that corresponds to weight on eye, and the processor is configured to receive data from the force sensor and the measuring device and to generate the sensed force-distance reference data by correlating weight on eye to the relative distance. wherein the force sensor is operable to generate data relating to the sensed forced that corresponds to weight on eye, and the processor is configured to receive data from the force sensor and the measuring device and to generate the sensed force-distance reference data by correlating weight on eye to the relative distance. <EOS>