A optic sight apparatus for a weapon that includes an electro-optical sight unit configured to project a reticle image for a sight setting of the optic sight apparatus, a controller electrically connected to the electro-optical sight unit; and a switching apparatus connected to the controller unit, the switching apparatus configured to transmit a sighting control signal to the controller unit to automatically change a current sight setting of the optic sight apparatus to a predetermined sight setting of the optic sight apparatus corresponding to the sighting control signal.