Understanding FOM in Night Vision: What Does It Really Mean? 2026-03-04
When you're navigating the complex world of night vision, one acronym appears more than any other: FOM, or Figure of Merit. It's the industry's go-to number for benchmarking the performance of an Image Intensifier Tube (IIT), the core component that makes night vision possible. This single value plays a dual role, serving as both a primary performance indicator and a key factor in international export regulations like ITAR. However, relying solely on this number can lead you into the "Spec Sheet Trap," where a high FOM on paper doesn't translate to superior image quality in the field. The true art of selecting the right device involves looking beyond this single metric. This guide provides a comprehensive decision-making framework, helping you evaluate night vision performance by understanding what FOM truly represents and, more importantly, what it leaves out.
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