What Is Dilation?
Dilation is the enlargement of the pupil, the black circle in the center of the eye. The pupil's size is regulated by the iris, the colored ring of tissue that surrounds the pupil. When the iris contracts, it reduces the pupil's size, while dilation occurs when the iris relaxes and the pupil enlarges.
What Causes Dilation?
Dilation can occur in response to a variety of stimuli, including bright light, stress, certain medications, and certain medical conditions. Bright light causes the pupil to constrict, while darkness causes it to dilate. Stress and certain medications can cause the pupil to dilate as well. Some medical conditions, such as Horner's Syndrome, can cause the pupil to remain constantly dilated.
When Should I See a Doctor?
If you have noticed that your pupils are always dilated, it is important to seek medical advice as soon as possible. A doctor can evaluate your condition and determine the underlying cause. In some cases, treatment may be necessary to correct the underlying cause of the dilation.