The possible causes of pinpoint pupils are: - opioids - narcotics - antihypertensive medications e.g., clonidine - heroine - horner syndrome - anterior uveitis - head trauna - organophosphate exposure Reference: https://www.medicalnewstoday.com/articles/320350 Image via: https://www.amboss.com/us/knowledge/Physiology_and_abnormalities_of_the_pupil/