Eye Health More Eye Issues & Safety Print Warning Signs That Your Red Eye Could Be Serious By Troy Bedinghaus, OD linkedin Troy L. Bedinghaus, OD, board-certified optometric physician, owns Lakewood Family Eye Care in Florida. He is an active member of the American Optometric Association. Learn about our editorial process Troy Bedinghaus, OD Medically reviewed by Medically reviewed by Ami A. Shah, MD on May 26, 2020 Ami A. Shah, MD, is a board-certified ophthalmologist and a practicing clinician specializing in oculofacial plastic and orbital surgery. Learn about our Medical Review Board Ami A. Shah, MD Updated on May 27, 2020 Dimitri Otis Collection/Stone / Getty Images More in Eye Health More Eye Issues & Safety Glaucoma Cataracts Macular Degeneration Vision Loss Dry Eye Syndrome Contact Lenses Glasses Exams & Procedures Vision Improvement Surgery Eye Anatomy Kid's Eye Health View All Most of the time, a case of red eye is short-lived and disappears on its own. Sometimes, however, red eyes can be caused by a more serious condition. The following danger symptoms in a red eye should be evaluated by a medical professional. Blurry Vision Blurry vision is often associated with serious ocular disease. If your eye is red and your vision is blurry, something significant is going on. You need an evaluation to determine what is causing both symptoms. When your doctor checks your vision during a routine eye exam, it is a simple, quick way to determine the health of the eye. If a patient can read the 20/20 line on the eye chart with ease, that tells the doctor that light is being focused on the retina fairly accurately and the retina is processing the information correctly. If your vision is acutely decreased with redness, this may indicate an issue in the transmission of light to the back of the retina due to a non-refractive issue. If your vision is blurry without associated redness, then it may be that you need vision correction or an update of your corrective prescription. Severe Pain Conjunctivitis may produce mild irritation or scratchiness, but not extreme pain. Severe pain is a symptom of keratitis, a corneal ulcer, iridocyclitis, or acute open-angle glaucoma. Severe pain should always be evaluated as soon as possible as damage can occur in a short period of time. For example, a corneal ulcer caused by a bacteria called Pseudomonas can advance to a blinding eye infection within 48 hours if not treated. Photophobia Photophobia, or extreme sensitivity to light, is usually a symptom of iritis. Iritis is an inflammatory disorder of the eye in which the ciliary muscle becomes inflamed and begins to spasm, causing the eye to feel sensitive to light. Light sensitivity is also a general symptom that occurs when the cornea is irritated. A corneal abrasion or corneal ulcer can bring on debilitating light sensitivity. Colored Halos Colored halos are a symptom of corneal edema and acute open-angle glaucoma. Usually, halos seen around lights are caused by a disruption in the optical system of the eye. The cornea, the clear dome light structure on the front part of the eye, becomes thicker, due to the swelling, or edema. As it thickens, it also becomes cloudy. When this occurs, light scatters and we see halos. If you think you may have one of the warning symptoms with red-eye, it is important to see a medical professional. Was this page helpful? Thanks for your feedback! Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life. Sign Up You're in! Thank you, {{form.email}}, for signing up. There was an error. Please try again. What are your concerns? Other Inaccurate Hard to Understand Submit Article Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Uveitis. National Institutes of Health. National Eye Institute. July 11, 2019 Upadhyay MP, Srinivasan M, Whitcher JP. Diagnosing and managing microbial keratitis. Community Eye Health. 2015;28(89):3–6.PMID: 26435583 Digre KB, Brennan KC. Shedding light on photophobia. J Neuroophthalmol. 2012;32(1):68–81. doi:10.1097/WNO.0b013e3182474548 Additional Reading R. Douglasss Cullom, Jr., Benjamin Chang, The Wills Eye Manual Office and Emergency Diagnosis and Treatment of Eye Disease, 2nd edition. Rev. ed. of: Wills Eye Hospital Office and Emergency Room Diagnosis and Treatment of Eye Disease, 1990. ISBN 0-397-51380-1. Chapter Differential Diagnosis of Ocular Symptoms, Pages 1-6 and Differential Diagnosis of Ocular Signs; Pages 7-17.