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Presently exciton activation of enzymatic oxidation of ethanol by human alcohol dehydrogenase (ADH) 1A enzyme is reported. The ADH1A enzyme was activated by infrared (IR) excitons transferred over Müller cell (MC) intermediate filaments (IFs). These IR excitons were generated by energy liberated upon enzymatic ATP hydrolysis and transferred to IFs. Also, the emission spectrum was recorded of the electronically excited ADH1A…NAD⁺…EtOH complexes obtained by energy transfer from IR excitons that traveled along IFs. These results support the hypothesis that ATP hydrolysis energy may be transmitted in vivo in the form of IR excitons, over the network of IFs, both within and between cells.