What feature helps the PSO-1 reticle facilitate distance marking?

The PSO-1 reticle is designed with illuminated chevrons that aid in estimating distances to targets effectively. These chevrons are calibrated for specific distances, allowing the shooter to align their aim accurately depending on the range to the target. By providing a visual reference that corresponds to known distances, the illuminated chevrons enhance the shooter's capability to make precise shots at varying ranges, converting the act of distance estimation into a more accessible and confident process. This feature is particularly useful in varied lighting conditions, as the illumination allows for better visibility of the reticle against different backgrounds.