Beware of Allergic Conjunctivitis When Using Air Conditioning, Doctor Advises Cleaning After Returning Home

An ophthalmologist is observing a recent increase in patients presenting with red, itchy, and swollen eyes, attributing the surge to seasonal shifts and environmental factors. Dr. Wang Meng-chi notes that changing temperatures, humidity, and airborne particles like pollen, dust mites, mold spores, and pollutants can irritate the eyes' surface.

For individuals with allergies, this irritation triggers mast cells in the conjunctiva to release histamine, leading to symptoms such as intense itching, redness, tearing, burning sensations, and increased discharge. Some patients also experience concurrent nasal allergy symptoms like sneezing and congestion. The doctor emphasizes that the most characteristic symptom is severe itching.

Preventive strategies focus on minimizing exposure to allergens. With warmer weather prompting the use of air conditioners, Dr. Wang advises thorough cleaning of units before use, as dirty systems can circulate allergens. He also recommends promptly cleaning the face and eye area upon returning home to reduce allergen residue. Regular washing of bedding, pillows, and curtains is crucial for controlling dust mites, and minimizing plush toys and excessive clothing indoors can also help.

During periods of poor air quality, wearing well-fitting sunglasses or goggles can shield the eyes from direct contact with airborne particles. Dr. Wang strongly advises against rubbing itchy eyes, as this can worsen inflammation. Cold compresses can offer relief by reducing the activity of allergic cells. While antihistamine, mast cell stabilizer, or immunomodulator eye drops may be prescribed by an ophthalmologist, he cautions against the long-term unsupervised use of steroid eye drops due to risks of glaucoma, cataracts, and infection.

Patients experiencing blurred vision, severe pain, significant discharge, or worsening symptoms should seek immediate ophthalmological examination to rule out more serious conditions like keratitis.