![]() Normal anisocoria is called “physiologic anisocoria.” It affects up to 20% of the population and isn’t harmful. The cause is often unknown, but may occur as a result of viral infection, trauma, narrowing of a blood vessel due to migraine, eye surgery and tumors.Īnisocoria – This is when you have uneven pupil size that could be normal or could be a symptom of an underlying health issue. Adie’s tonic pupil usually affects only one eye but it can be present in both eyes. Some common conditions the PERRLA test can detect include:Īdie’s tonic pupil – This is a nervous system condition that may lead to unequal pupil sizes and cause a slow reaction to light. Properly functioning pupils will get smaller as the object gets closer.Ĭommon conditions the PERRLA test can detect To test your pupils’ accommodation, the doctor will have you focus on an object they are holding in their hand while moving that object closer to your nose. And they will dilate equally (become larger) when the light is turned off. If there is no optic nerve or retinal disease, both pupils will constrict (get smaller) equally at the same time in reaction to this bright light. The doctor will dim the room lights and will shine a narrow beam of light into one eye for about three seconds and then into the other eye. Next, the doctor will perform the swinging light test to see how your pupils react to light. The PERRLA eye test includes the following steps:įirst, your eye doctor will look at your pupils to see if they are round and the same size. They should also get smaller when you’re focusing on something very close to your eyes (accommodation). Reactive to light and accommodation – If your pupils are reacting to light as they should, they will get smaller when you’re looking at bright or direct light. Your pupils also change size to give you the best vision depending on your current circumstances.ĭuring a PERRLA test, an eye doctor checks to see if your pupils are:Įqual – Both of your pupils should be the same size and shape. Your pupil adjusts to different light levels to help you see clearly things that are up close and far away. It dilates to let more light in and constricts to let less light in. It allows light to enter the eye so that the light can be focused onto the retina. The pupil is the opening in the center of the eye. Plus, a properly functioning pupil is critical for good vision. The PERRLA eye test can indicate whether you have certain health issues, such as eye diseases and some visual and neurological conditions. ![]() It is essential that your eye doctor perform this test in any comprehensive eye exam. PERRLA is an acronym for “pupils are equal, round and reactive to light and accommodation.” The PERRLA eye test is used to check if your pupils look and function normally.
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