biostudies-literatureUnknown51(4)Berry STo work effectively, the eyes of nocturnal insects have a problem they must overcome. During the night, the light levels are low, so their eyes need to be very sensitive; but they also need a way of adapting to environmental light conditions, and protecting those sensitive organs, if a bright light is encountered. Human eyes have a pupil that changes size to regulate light input to the eye. Moths (Lepidoptera) use a light absorbing pigment that moves position to limit the light within the eye. This pigment migration is difficult to record because it is a dynamic process and will only occur in a live moth. This paper presents the first use of Ocular Coherence Tomography as a method of viewing anatomical detail in a compound eye. This is noninvasive and does not harm the insect. To demonstraEnvironmental entomology643-648https://www.ebi.ac.uk/biostudies/studies/S-EPMC9389422biostudies-literatureThe Use of Optical Coherence Tomography to Demonstrate Dark and Light Adaptation in a Live Moth.PMC9389422Berry SfalseThe Use of Optical Coherence Tomography to Demonstrate Dark and Light Adaptation in a Live Moth.To work effectively, the eyes of nocturnal insects have a problem they must overcome. During the night, the light levels are low, so their eyes need to be very sensitive; but they also need a way of adapting to environmental light conditions, and protecting those sensitive organs, if a bright light is encountered. Human eyes have a pupil that changes size to regulate light input to the eye. Moths (Lepidoptera) use a light absorbing pigment that moves position to limit the light within the eye. This pigment migration is difficult to record because it is a dynamic process and will only occur in a live moth. This paper presents the first use of Ocular Coherence Tomography as a method of viewing anatomical detail in a compound eye. This is noninvasive and does not harm the insect. To demonstra2022-01-01T00:00:00Z2022 Aug2025-04-22T10:58:07.661Z2024-11-12T14:14:15.395ZS-EPMC93894223576233510.1093/ee/nvac044