This is the peer reviewed version of the following article: MCMURCHIE, B. ... et al, 2021. Dietary omega‐3 supplementation causes rapid, reversible changes to dark adaptation ability. Clinical & Experimental Ophthalmology, 49 (4), pp.390-392, which has been published in final form at https://doi.org/10.1111/ceo.13925. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.