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A diopter sight is an aperture sight component used to assist the aiming of ranged weapons, mainly firearms, airguns, and crossbows. Diopters function to precisely align the shooter's eye with the front sight and the target, while also producing beneficial optical effects for accurate aiming. A diopter must be paired with a complementing front sight element to obtain a usable sighting line. Diopter sights used for modern target shooting allow for very fine windage and elevation adjustments, moving the impact point on the order of less than five millimeters at a range of 100 metres. High end diopters typically accept accessories to aid the shooter's ability to see the target clearly.
Diopters are found in particular as rear sight elements on rifles. Diopter and globe sighting setups are commonly used in ISSF rifle shooting events.