The eyes are the windows to the soul. They can also tell you a lot about what drugs a person may have been using. Certain drugs, like marijuana, are famous for dilating the vessels in the eye and producing a very noticeable red-eye. Other drugs affect the pupil directly, causing it to dilate, constrict or react abnormally to light. With a little guidance and practice, you can detect these signs readily. The pupilomter is the same tool used by diagnostic professionals when measuring the diameter of the pupil. We include it here with the Drug Symptom Matrix, to show you how certain drugs affect the eye.

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