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Bell's palsy is a sudden weakness or paralysis of one side of the face due to inflammation of the facial nerve. The eyelids may not close fully, causing exposure and dryness of the eye on the affected side. Tearing, sensitivity to light, and blurry vision can follow if the surface is unprotected. Most people recover function over weeks to months.
read more about bell's palsy ...The exact cause is unclear, but viral reactivation (often herpes family viruses) is strongly suspected. Inflammation and swelling compress the nerve within its bony canal. Risk increases with diabetes, pregnancy, and recent upper respiratory infection. Clinicians rule out stroke and other causes when symptoms begin.
Swelling around the facial nerve limits blood supply and signal transmission. The sudden paralysis on one side of the face typically recovers as inflammation resolves and normal nerve conduction returns.
You should see your eye doctor if you notice sudden or persistent changes in your vision such as blurriness, flashes of light, floaters, or eye pain. Redness, swelling, or discharge that does not improve with basic care also warrants a checkup. Even if symptoms seem mild, getting a professional evaluation can help detect problems early and prevent complications. Regular eye exams are also important to monitor your overall eye health and keep your vision clear.
Protecting the cornea is the priority: frequent lubricating drops, thicker ointment at night, and eyelid taping during sleep prevent exposure damage. Moisture chamber shields and temporary weights may be used. If the blink is poor, specialists may place external weights or perform procedures to improve closure. Regular checks ensure the surface stays healthy.
Early oral corticosteroids improve the chance of full recovery. Antiviral medication is sometimes added for suspected viral reactivation. Facial physical therapy supports symmetry and reduces synkinesis during healing. Most patients see steady improvement over several weeks.
Facial droop with arm or speech changes requires emergency stroke evaluation. Eye pain, discharge, or persistent exposure symptoms need prompt ophthalmic care. Worsening weakness after initial onset should be reassessed. Timely care protects both vision and facial function.
Will vision be permanently affected? Usually no if the cornea is protected.
How long does recovery take? Many recover within weeks; some require months.
Can it recur? Recurrence is uncommon but possible.
“Bell’s Palsy.” National Institute of Neurological Disorders and Stroke (NINDS). https://www.ninds.nih.gov/health-information/disorders/bells-palsy. Published Apr 2, 2024.
“Bell’s palsy. Symptoms and causes.” Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/bells-palsy/symptoms-causes/syc-20370028. Published Oct 22, 2024.
“Bell’s palsy.” MedlinePlus Medical Encyclopedia. https://medlineplus.gov/ency/article/000773.htm. Published Nov 30, 2025.
“Bell’s Palsy.” Cleveland Clinic. https://my.clevelandclinic.org/health/diseases/5457-bells-palsy. Published Aug 14, 2023.
“Bell’s palsy.” NICE Clinical Knowledge Summaries (CKS). https://cks.nice.org.uk/topics/bells-palsy/. Published Feb 2023.