How does a reflex sight work?
The basic technical principle of red dot sights is easy to explain: basically, a small LED creates a colored point of light that is reflected against a small, spherical, semi-transparent mirror and thrown back onto the front lens as a luminous target.
Description of Red Dot Sights
Favored by civilian shooters, military, and law enforcement personnel worldwide, red dot sights are designed to put the target and the reticle on the same optical plane for lightning-fast target acquisition. Most red dot sights utilize a small, yet powerful LED emitter to generate an illuminated dot reticle that stays in alignment with the weapon—regardless of eye position—for parallax-free performance. In addition to parallax-free reliability, red dot sights offer unlimited eye relief for superior optical clarity and precision in close, fast-action environments where maneuverability may be limited. Because of this, red dot sights allow shooters to keep their attention on the field of view in front of them with both eyes open for enhanced situational awareness.