Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Test, pupil dilation
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Test, pupil dilation: Opening the pupil wide enables an eye care professional to see more of the retina, the light-sensitive layer of tissue at the back of the eye. Dilating (widening) the pupil permits the retina to be examined for signs of disease. To do this, drops are placed into the eye to dilate the pupil. After dilation, vision may remain blurred and the patient may be bothered by the brightness of the sun for several hours.