A sight is an aiming device used to assist in visually aligning ranged weapons, surveying instruments or optical illumination equipments with the intended target. Sights can be a simple set or system of markers that have to be aligned together with the target, or optical devices that allow the user to see a sometimes optically enhanced image of the target aligned in the same focus with an aiming point. There are also sights that project an aiming point onto the target itself, such as laser sights and infrared illuminators on some night vision devices.
