Alcohol – Intoxication can lead to double vision, enlarged pupils, rapid eye movements, blurry vision.Here are specific changes in pupils, eye motion, or vision that often indicate intoxication or overdose based on the specific type of substance. Changes in pupil size: constricted or dilatedĪlmost every substance that is taken in excess has the potential to cause changes in the eyes of the user.Rapid involuntary movements of the eyeballs.Other common signs of intoxication indicated by the eyes include: Elements of the drug affect neurotransmitters in the brain that control mydriasis. Depending on the type of drug taken, different substances affect either the parasympathetic, sympathetic, or both systems. Specific drugs such as psychotropic stimulants affect both of these nervous systems and cause pupil dilation. The sympathetic nervous system controls the body’s fight-or-flight response, which is what triggers the dilator. The parasympathetic nervous system is responsible for controlling a person’s autonomic processes while an individual is at rest, is what triggers the iris sphincter to respond.
Drug use affects pupils in many ways.ĭilation of the pupil, also known as mydriasis, is the process in which the iris opens due to the activation of two muscle groups in the eye: the iris sphincter and the iris dilator. Pinpoint pupils are a common symptom of opioid intoxication and potential overdose. For example, bloodshot eyes are a common symptom of intoxication from a variety of drugs such as alcohol, cocaine, and marijuana. Changes in the eye, such as pupil size, motion, and color of the whites of the eyes, are used to assess whether a person is intoxicated and what substance he/she has misused. Not only does alcohol and drug abuse cause side effects such as nausea, sleepiness, mood changes, aggression, and loss of coordination, but also dilated pupils as well. Dilated pupils can shed light on drug use as well as indicate which particular drug was used. One of the key indicators that an individual is under the influence of an illicit substance is the dilation level of the eyes. Law enforcement officers and medical professionals often face situations in which individuals are struggling with substance misuse. For example, you can look at how drugs affect pupils. Fortunately, there are many signs that indicate an individual has been using drugs.
Many individuals may feel as if they are overreacting or perhaps they are certain their loved one is struggling but afraid to approach the situation. Suspecting a loved one of abusing drugs and/or alcohol is a confusing and heart-wrenching experience.
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