Allergic conjunctivitis is a common eye condition that can affect people of all ages. It often causes itching, redness, and eye discomfort, and may recur if not properly managed. In some cases, persistent or improperly treated allergic conjunctivitis can lead to complications that may affect vision. 

What Is Allergic Conjunctivitis? 

The conjunctiva is a thin membrane that covers the white part of the eye and lines the inside of the eyelids. Allergic conjunctivitis occurs when the conjunctiva becomes inflamed due to an immune reaction to allergens such as dust, pollen, animal dander, chemicals, or environmental irritants. 

When exposed to allergens, the body releases inflammatory substances that cause itching, redness, and irritation in the eyes. 

Common Types of Allergic Conjunctivitis 

Allergic conjunctivitis can appear in several forms, including: 

  • Acute allergic conjunctivitis: Symptoms appear quickly after exposure to allergens. The eyelids and conjunctiva may become swollen, which can worry patients, but symptoms usually last only a few hours and often resolve on their own. 
  • Seasonal or perennial allergic conjunctivitis: Symptoms may worsen during certain seasons or persist throughout the year and are often associated with allergic rhinitis. 
  • Vernal keratoconjunctivitis: This form is more common in boys aged 5–7 years, especially those with a history of eczema or allergies in the family. It may affect the cornea and potentially impact vision if not treated properly. 
  • Atopic keratoconjunctivitis: Typically occurs in adults with a history of eczema or asthma. It usually persists year-round and may affect the conjunctiva, eyelids, and cornea, sometimes leading to decreased vision. 
  • Giant papillary conjunctivitis: Often caused by prolonged mechanical irritation from contact lenses, artificial eyes, or surgical sutures, resulting in large papillae forming on the inner surface of the eyelid. 

Symptoms of Allergic Conjunctivitis 

Acute symptoms may include: 

  • Red eyes with a gritty or sandy sensation 
  • Eye discharge that may be clear or yellow 
  • Swollen and red eyelids 
  • Eye pain, light sensitivity, or blurred vision in some cases 
  • Occasionally fatigue, mild fever, sore throat, or swollen lymph nodes near the ear 

It is important to distinguish this condition from severe bacterial conjunctivitis, which can progress rapidly and produce heavy pus discharge, potentially damaging the cornea if not treated promptly. 

Chronic allergic conjunctivitis symptoms may include: 

  • Persistent redness of the eyes 
  • Frequent eye itching 
  • Ongoing eye discomfort 
  • Sticky discharge that makes it difficult to open the eyes in the morning 

Can Allergic Conjunctivitis Cause Complications? 

Allergic conjunctivitis itself is usually not dangerous. However, if left untreated or managed incorrectly, complications may occur. 

  • Corneal ulcer: This is a serious complication that may cause severe eye pain, redness, light sensitivity, tearing, and noticeable vision loss. In severe cases, it may threaten the integrity of the eye. 
  • Reduced vision: Long-lasting inflammation or secondary infection may lead to eye strain, dryness, blurred vision, and reduced visual clarity. With early diagnosis and appropriate treatment, long-term vision damage is uncommon. 

When Should You See a Doctor? 

You should consult an eye specialist if you experience: 

  • Persistent eye redness, itching, or discharge that does not improve 
  • Eye pain, light sensitivity, or blurred vision 
  • Severe eyelid swelling or signs of corneal involvement 
  • Children with recurrent episodes of allergic conjunctivitis 

Early medical evaluation helps prevent complications and ensures appropriate treatment. 

Protecting Your Eye Health 

Although allergic conjunctivitis is common, it should not be ignored. Avoiding allergens, maintaining proper eye hygiene, and seeking medical care when symptoms appear are important steps to prevent complications and protect long-term vision. 

At Hoan My Cuu Long Hospital, patients can receive comprehensive eye examinations and treatment with experienced specialists and modern equipment, supporting accurate diagnosis and timely care for eye conditions.