Cytokine‐inducible nitric oxide synthase is an immune regulator in the retina and mainly found in Müller cells and in retinal pigment epithelium.18 iNOS is induced under pathological conditions by endotoxins, inflammation, and cytokines and causes pathophysiological reactions leading to optic nerve and retinal degeneration.8 It is involved in phagocytosis during infectious and ischaemic processes. Here, NOS2 is linked to retinal degeneration.