Haploscope measurements of accommodation and accommodative vergence over a range of stimuli to accommodation were carried out on six young adult observers at various levels of alcoholic intoxication. In all cases there was a decrease in response AC/A proportional to the level of blood ethanol. A change in blood ethanol of 0.01 gm/100 cc is, on the average, associated with about a 5% decrease in AC/A. Each subject also demonstrated an increase in tonic convergence which returned to the baseline or overshot before the blood ethanol level returned to zero.
Cohen MM, Alpern M. Vergence and AccommodationVI. The Influence of Ethanol on the AC/A Ratio. Arch Ophthalmol. 1969;81(4):518-525. doi:10.1001/archopht.1969.00990010520010