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Drugs can cause a pupil to change in two ways by dilation making the pupil larger or constricting the pupils.â¦ Only two drugs constrict the pupils those being opiates and alcohol. So anything but, these can cause the pupils to dilate.
Speed causes dilation and drugs like morphine cause pinpoint type pupils. There is no harm in it. Dilation or contraction of the pupil is caused by muscles in the eye that tighten or relax. All I'd really say is to keep your eyes protected from light, as your eyes are taking in more light when they are open like that. Sunlight exposure is a risk factor for AMD (macular degeneration) when you get old, etc.