Adie’s Pupil Explained: Why One Pupil is Larger & Light Sensitivity

Adie’s pupil explained: Why is one pupil larger than the other? If you’ve noticed unequal pupils (anisocoria), a pupil that doesn’t react to light, or sudden light sensitivity, this video explains one possible cause. Learn more at https://www.kinglasik.com/ In this Eye Essentials episode, Dr. Joseph King discusses Adie’s pupil (Adie syndrome), a neurological eye condition that affects how the pupil responds to light and how the eye focuses on near objects. Many patients first notice one pupil bigger than the other, especially in bright light. The affected pupil may respond very slowly to light, leading to photophobia (light sensitivity) and difficulty reading or focusing on close objects. In this video you’ll learn: • What Adie’s pupil is and how it affects the nervous system • Why a pupil may stay dilated or react slowly to light • Common symptoms like unequal pupils, light sensitivity, and near vision problems • How ophthalmologists diagnose Adie’s pupil using pilocarpine testing and eye exams • Treatment options for photophobia, glare, and focusing difficulty Adie’s pupil is often linked to damage to the ciliary nerves that control pupil size and accommodation. While the cause isn’t always known, it may occur after viral infections, bacterial infections, or autoimmune responses affecting the eye’s nerve pathways. The reassuring news is that Adie’s pupil is usually benign and not related to serious brain conditions. With proper diagnosis and simple treatments like sunglasses, prescription lenses, or special eye drops, most patients manage symptoms very well. If you’re experiencing: • One pupil bigger than the other • Unequal pupils (anisocoria) • Pupil not reacting normally to light • Sudden light sensitivity or glare • Trouble focusing when reading You should have a comprehensive eye exam with an eye care professional.