From the scope, the sights that use dot reticles are nearly invariably measured in minute of angle (MOA). The most common reticles used, is the red dot sight; is a small dot, covering 5 MOA (1.5 mrad), illuminated by a red light from the LED. Therefore, it is given the common term, "red dot sight".
MOA is a convinient measure for shooters using English units. Since 1 MOA from the scope is about 1.0472 inches at a distance of 100 yards (91.44m). Generally, it would be rounded up to 1 inch at 100 yards, which made the MOA a h
andy unit to use in ballistics.
Many reticle illumination and pattern options are available as well. Common light sources used in reflex sights requires battery powered lights, fiber optic light collectors, and even tritium capsules. Some other reflex sights are specially designed to be visible when view through night vision devices.
The colour of a reflex sight reticle are commonly red or amber for visibility against most backgrounds, as for green colour, it is also sold in the market and become widely available. Reticle shapes doesn't always stick to dots, but also some use chevron or triangular pattern. These patterns also help aid the precision of aiming and range estimation, and still others provide selectable patterns and holographic reticles.
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