8/31/2023 0 Comments Normal pupil size in room lightMedications that Cause Large Pupils as a Side Effect The primary affect of these eye drops is to increase the size of the pupil and will typically be very effective and cause a much larger pupil than an eye without the medication. These dilating drops may be prescribed for eye inflammation, amblyopia in children, and other eye conditions. These dilating drops are not available over the counter and are only prescribed for at home use in a few eye conditions.Ĭommon medications that are considered dilating eye drops are tropicamide, phenylephrine, atropine, and homatropine. One of the most common eye drops that is used by eye doctors, dilating drops are a type of medication designed to cause the pupils to become large in order to allow the doctor to examine the back of the eye. However, if the pupil is constantly large, even in bright light, it is likely associated with medication or a disease or condition. If the pupil is large in dim light and then returns to a small size when bright light is shined in the eye or in the room, the large pupil may be completely normal and a result of the iris changing size due to the light. The cause of a large pupil is important to determine as some causes can indicate a larger disease that is involving the eyes. The size of the pupil changes due to light, medication, and some disease processes.Ī large pupil is considered a dilated pupil and may reach a size of up to ten millimeters across. ![]() The pupil is actually a hole that allows light to enter the eye. ![]() The pupil is the black circle in the middle of the colored portion of the eye, the iris.
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