This condition can affect one or both eyes, and it can be horizontal, vertical, rotatory, or a combination of these. Nystagmus is an involuntary eye movement that occurs when the eyes are at rest. Cataracts are not painful, but they make it hard to see well and can lead to blindness if they aren’t treated immediately. For example, smoking can lead to cataracts over time.Ī cataract is an opacity or cloudiness of the eye’s lens that may make it harder to see clearly. CataractsĬataracts are one of the most serious side effects of recreational drug use. It’s caused by how your brain processes visual information in response to the drug, and it can make it hard for you to drive, work, or do other tasks that require good vision. Blurry Visionīlurry vision is a common side effect of recreational drugs, and it can last for hours or even days after you use certain drugs. This effect can be caused by drugs that influence the signals sent from one part of your brain to another, such as stimulants, sedatives, and tranquilizers. Double Visionĭouble vision, also known as diplopia, happens when you look at an object with both eyes, but the image on each retina is slightly different from the other, so your brain sees two images instead of one. The most common cause of miosis or pupil contraction is an issue with the iris sphincter muscles or nerves that control them. If your pupils look like two tiny dots even when they’re relaxed, it’s called miosis. Your pupils will be dilated when you’re in a dimly lit room or in a dark area of a building. The size of your pupils also changes depending on how much light there is around you. In most cases, the dilation of pupils happens with drugs that increase dopamine in the brain. This change in proportions is attributed to the effects of certain drugs on the nervous system. Dilated Pupilsĭilated pupils look larger than usual, usually two to three times their normal size. Here are some of the most common eye changes that drugs can cause: 1. If you notice any sudden or unusual changes in your vision after starting a new medication, you must talk to your doctor immediately. Some of these changes may be temporary, but others may be permanent. Eye Changes That Drugs Can CauseĮye changes are a common side effect of many drugs. These organs of vision can reveal things like infections, allergies, and other health conditions.ĭrugs can affect your eyes in a variety of ways, and these effects can be signs of greater damage. Your eyes are the window to the soul, and they can tell a lot about your health.
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