iot Optical sensor market was valued at USD 2,692 million in 2026 and is projected to reach USD 13,733 million by 2036, recording a CAGR of 17.7% during 2027–2036. Asia-Pacific was the largest region in 2026 at an estimated ~41% share. The market centers on silicon or compound-semiconductor light detectors, integrated optical filters, infrared emitters and readout circuits for proximity, physiological, ambient-light, object-detection and connected equipment feedback