Biological redox chemistry is traditionally described in terms of oxidant and reductant abundance, redox potential, and associated measures of oxidative stress. While informative, these scalar descriptors fail to explain why systems with comparable redox activity can exhibit profoundly different functional outcomes, or why the same pathology, across different biological contexts, may display opposing redox stress phenotypes. Here, we introduce redox coherence and redox decoherence as distinct emergent biological states arising from the integrity of a Redox Photonic Coupling System (RPCS). In this framework, redox chemistry is organized along two coupled axes - oxidative excitation and reductive assimilation - whose spatiotemporal synchronization within a nanodomain Coherence Interface (CI) determines whether redox-derived excitation is resolved into organized hydration shell architecture associated with adjacent biological substrates or dissipated through unstructured pathways.We define redox resilience as the capacity of the system to restore coherent resolution following perturbation, emphasizing recovery dynamics rather than static redox balance, and identify loss of this resilience as the defining feature of redox decoherence. Within this framework, oxidative and reductive stress are not primary causes but directional expressions of an underlying decoherent state, shaped by axis dominance and CI desynchronization.Distinct photonic outcomes are associated with these organizational states: Photonic Activation Quanta (PAQ) reflect coherent resolution and propagation of excitation, tightly coupled to organized water formation, whereas Decoherent Photon Emissions (DPE) mark dissipative resolution modes. The PAQ:DPE ratio thus provides a dynamic, state-sensitive readout of redox organization and recovery capacity, rather than a measure of oxidant or antioxidant burden alone.Together, this framework reframes redox biology as a state-dependent process governed by spatiotemporal organization, structured hydration and resilience, offering a unifying principle for interpreting redox physiology and pathology beyond redox magnitude.