The red dot sight technology invented by Aimpoint allows a shooter to do what comes naturally — keep both eyes open while focusing on a target. When a shooter is target focused and brings their sight into view the brain notices the red dot through the lens of the sight.
When the red dot is on the target, you’re on target. As long as you are properly zeroed, there is no need to center the dot in the sight. This allows for quick target acquistion. It is this combination of speed and accuracy that makes red dot sights the preferred choice for beginners and experts alike.
Red dot sights are made without magnification or optical distortion. Unlike lasers, which project a red dot onto a target, red dot sights are all internal allowing only the shooter to see the red dot on their target.
The red dot sight uses a LED (light emitting diode) which is completely eye-safe compared to a laser which produces an emission that can be harmful to your eyes.
The dot in red dot optics have different sizes and is measured in MOA, which stands for "minutes of angle".