Night Environment lights LOD radius Demystified! There seem to be a misconception or maybe just lack of advertising on our end, Either way let’s take a moment to demystify Night Environment lights LOD radius, Let’s start with the most basic question; How Far Can the Human Eye See? The Earth's surface curves out of sight at a distance of 3.1 miles, or 5 kilometers. But our visual acuity extends far beyond the horizon.