They do this to restrict the amount of light that meets the eye. This is a natural protection mechanism. Many drugs can cause dilated pupils. Here are just a few medications and illegal drugs that can cause dilated pupils:. All Vision Center content is medically reviewed and fact-checked by a licensed optometrist to ensure the information is factual and meets industry standards.
We have strict sourcing guidelines and only cite from recent scientific research, scholarly articles, textbooks, government agencies, optometry websites, and medical journals. Updated on October 22, Dilated Pupils Mydriasis. Medically Reviewed by. Written by. AnnaMarie Houlis. In this article. What Are Dilated Pupils Mydriasis? Is it safe to have dilated pupils? How does it feel to have dilated eyes?
The observation of that nerve is a crucial part of a comprehensive eye examination. Both the dilated and the undilated eye exams provide important information to an eye doctor. One of the first parts of a comprehensive eye exam is a test of your vision, and perhaps a measurement to determine an eyeglass prescription, both of which require that your eyes remain undilated. This can be important for determining whether the visual pathways for each eye are functioning properly. When the angle is narrow, only portions of the drainage angle are visible, and in acute angle-closure glaucoma, none of it is visible.
Part of a glaucoma examination is formal visual field testing , where your peripheral, or side vision, is tested. Ideally, your eyes are not dilated during this test. Finally, there are other parts of the front of the eye, the iris for example, which should be examined when your eyes are not dilated. The view to the back of the eye is limited when the pupil is not dilated. When your pupil is small, an eye doctor can see your optic nerve and macula but the view is limited.
In order to see the entire retina, the pupil must be dilated. This is achieved through the use of eye drops. When eyes are dilated during an eye exam, it typically takes hours for pupils to return to normal. Some individuals may experience eye dilation that lasts longer. Once your eyes are dilated, there is an increase in light sensitivity because the pupil is large and more light is coming through, so bring your sunglasses , or your ophthalmologist may provide some disposable shades for your use.
You may also experience blurry vision, particularly if you are trying to read. If it is your first time having your eyes dilated or you know your vision is too impaired for driving after dilation, bring a friend or companion to drive you home from your examination. While in the past there were some eye drops that could reverse the dilation, these are no longer available, so you will have to wait the hours before the drops completely wear off.
The optic nerve can be seen through an undilated pupil, but for optimum viewing a dilated pupil is required. This is important for the diagnosis of glaucoma , as well as other diseases of the optic nerve. A dilated pupil sometimes can still react to light — that is, get smaller in bright light or when a light is shined at the eye.
How long do dilating drops last? Dilating eye drops used for examination of the eyes usually last anywhere from 4 to 24 hours. This depends on the strength and type of the drop, and on the individual patient. Dilation can last longer in people with lighter colored eyes, and in some cases, may last longer than 24 hours.
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