The eye drop which can make the pupil smaller is used to treat glaucoma. The eye drops which make the pupil larger are used frequently in eye exams. There are several eye drops which are designed to make the pupil larger or smaller. Pupil sizes can also be changed using medications. There is the potential for recovery if the cause is treated appropriately, but many of these palsies will not have favorable recoveries. ![]() If this nerve becomes damaged – such as a stroke or being pressed by a tumor – the pupil cannot become smaller and will constantly appear much larger.Ī cranial nerve palsy can be a very serious condition and impact vision and other neurological functions. The third cranial nerve is responsible for providing the signal for the iris to constrict, or shrink, as needed. Horner’s syndrome is not usually a permanent condition, and it will often resolve entirely if the underlying cause is identified and treated. The classic presentation of Horner’s syndrome includes a slightly droopy eyelid, a small pupil, and a lack of sweating on the side of the face. There are many causes of Horner’s syndrome.Īnything which can impact the sympathetic nervous system, specifically the nerves around the eyes and face can cause a Horner’s syndrome. Horner’s syndrome is a condition that affects the nervous tissue around the eye and face. The affected pupil will always be smaller than the other one. This condition is not associated with any other symptoms or issues but is a permanent change. In this condition, the pupil will not become larger even while the other pupil is able to enlarge as normal.Īdie’s tonic pupil is common in females among the ages of thirty to fifty. Some of these conditions are permanent while others will subside after a period of time.Ī condition known as Adie’s Tonic pupil is a condition in which one of the two pupils is much smaller than the other. When one pupil is smaller or larger than the other, the cause may be a number of conditions such as Adie’s tonic pupil, Horner’s syndrome, a cranial nerve palsy, or the use of medications in the eye can result in different pupil sizes. However, all of these changes to the size of the pupils will occur equally between the two eyes in a typical, healthy individual. Looking up close will cause the pupil to constrict slightly and become a little smaller. Other than in different lighting conditions, the pupil will change sizes when looking at things far away or things up close. ![]() ![]() This change in pupil size is a normal part of everyday life and is an involuntary process that occurs without conscious thought. The colored part of the eye, the iris, has muscles within it that can make the pupil shrink in bright light and enlarge in dim light. The pupil is able to change its size according to the amount of light around the eye. In many cases, these conditions do not have many other symptoms, but there are conditions which have different pupil sizes as a symptom along with other more severe symptoms. There are some conditions which can cause the two pupils to be different sizes. In most instances, the two pupils will be the same sizes and shapes. This is a hollow area that allows light into the eyes. The black part of the eye is called the pupil.
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