Mirrors are an important component to the architectural design of interior and exterior applications for residential, commercial, and industrial settings. Through its reflective qualities, a well-placed mirror can bring light into the living space as well as provide a feeling of enlarging the space around you. However, reflective images from the mirror may exhibit slight distortion, which is a function of the glass used to fabricate the mirror or the result of the mirror installation. This Glass Information Bulletin was written to provide you with information and expectations of allowable reflective distortion in annealed flat glass mirrors. This document was first published in 2018.