Through the adjustment of pupils, we maintain proper light to enter our eyes and there will be no excessive light to damage the retina. These are small, unequal, misshapen pupils that do not normally react to light. Syphilis: Syphilis can cause an Argyll-Robertson pupil.

Head trauma: Head injury or concussion can cause unequal pupils.Brain aneurysm: An aneurysm in the brain can cause a dilated pupil, as well as other symptoms.Third cranial nerve palsy: A complete third eye palsy results in one eyelid completely closed, with the eye bulging outward and downward.In this condition, your pupil stays expanded and shows very slight changes in size. Adie’s tonic pupil: Adie's tonic pupil is a rare neurological disorder that affects only one eye.It's usually harmless and does not require treatment. About 20% of healthy people have some degree of anisocoria. Anisocoria: Anisocoria simply means you have unequal pupil sizes in the two eyes.Here are some of the most common pupil disorders.

Symptoms of an abnormality in pupil function include headache, light sensitivity, double vision, and drooping eyelids. Health Problems That Can Affect the Pupilįlaws in the pupil could be the result of a disorder of the eye or the pathway connecting the brain and the eye. Note the quality and speed that your pupils respond to bright and dark light as well. You can also look at the size and shape of your pupils in bright and dim light. But in some cases, unequal pupil sizes can be a symptom of a disease. Twenty percent of the general population has slight anisocoria that does not signal anything abnormal. When your doctor examines your pupils, they will first look for anisocoria-a condition in which they are not the same size. For example, the pupil is the widest around age 15, after which it begins narrowing inconsistently after age 25. The maximum pupil size differs significantly among different ages.In an adult, the pupil's diameter usually varies between 2 and 4 millimeters in bright light and between 4 and 8 millimeters in the dark.If the pupils do not vary in size in response to changes in lighting and gaze, there might be something wrong. Pupil size also changes based on whether you are looking at something close or far away.When there is a lot of bright light, your pupils will become smaller. Pupils tend to become bigger in low-light situations, allowing more light into the eyes, making it easier to see.The size of your pupil keeps changing according to the lighting conditions around you. The pupil is round in shape and appears black because the light striking it's absorbed into deeper parts of the eye. Factors that cause your pupils to become bigger or smaller are light, certain medications and diseases, and even mental reactions. Usually, our two pupils will be roughly the same size, and pupil size overall can fluctuate. Muscles located in your iris (the colored part of your eye) control each pupil. Their function is to let in light and focus it on the retina (the nerve cells at the back of the eye). We use our eyes every day, have you noticed your pupils? Pupils are the black center of the eyes. You could find more details about the normal pupil sizes you should know. Is the pupil on one side significantly larger or smaller than the pupil on the other side? If so, you may have uneven pupil sizes. Look carefully into your eyes in the mirror. When a person suffers from certain diseases or uses certain drugs, the pupils will also open or shrink. Pupils will open up when you are nervous and excited and will shrink when you take a deep breath and sleep.

The pupils of myopia patients are larger than those of hyperopia patients. Generally speaking, the pupils of the elderly are small, while the pupils of young children to adults are larger, especially during adolescence. It is generally 2 to 5 mm, with an average of about 4 mm. Pupil size varies with age, race, refractive status, light intensity, target distance, and emotional changes. The pupil is the channel through which light enters the eye, and the opening and shrinking of the pupil control the amount of light entering the pupil.

Image of unequal pupil size