What is Allergic Conjunctivitis?

Allergic Conjunctivitis is one of the most common eye conditions in India, affecting people of all ages, and it tends to flare up when the body reacts to something in the environment, like pollen, dust, or pet hair.

Understanding Allergic Conjunctivitis

Allergic conjunctivitis is extremely common in India, and for good reason. The combination of high pollen counts, dust, air pollution, and rapid weather changes, especially during spring and monsoon transitions, creates a perfect environment for eye allergies to flare up. Many people experience it every year during the same season without realising it has a name or that it can be properly managed.

Allergic conjunctivitis affects up to 40% of people at some point in their lives, making it one of the most frequently seen eye conditions in any eye clinic. Despite this, many people dismiss it as “just dusty eyes” and do not seek care, which can lead to prolonged discomfort and, in some types, risk to vision if left unaddressed.

The condition can affect one or both eyes and tends to come and go depending on exposure to triggers. Some people have it only during certain seasons, while others deal with it throughout the year.

What are the Allergic Conjunctivitis Symptoms?

The allergic conjunctivitis symptoms are usually easy to recognise, especially if they appear suddenly after exposure to dust, smoke, pollen, or an animal. The allergic conjunctivitis symptoms tend to affect both eyes at the same time, which is one way to tell it apart from an eye infection, which usually starts in one eye.

Knowing the common allergic conjunctivitis symptoms helps you get the right care faster, rather than trying home remedies that may not address the actual cause.

Common Allergic Conjunctivitis Symptoms

Allergic Conjunctivitis Symptoms in Children

Children often cannot describe their allergic conjunctivitis symptoms clearly. Instead, watch for:

• Frequent eye rubbing, especially after coming in from outside
• Red or swollen eyes that appear quickly after contact with a pet or in a dusty room
• Complaints of “something in my eye” without any visible foreign body
• Avoiding bright light or squinting more than usual

When Should You See a Doctor?

See an eye specialist if:

• The itching, redness, or watering does not improve within a couple of days
• The discharge becomes thick, yellow, or sticky (this may suggest an infection rather than an allergy)
• Vision becomes noticeably blurry
• The allergic conjunctivitis symptoms worsen over time or keep coming back
• A child is rubbing their eyes very frequently, as prolonged rubbing can damage the cornea

What are the Types of Allergic Conjunctivitis?

Not all eye allergies are the same. There are different types of allergic conjunctivitis, and each one has slightly different triggers, patterns, and management needs. Knowing the type helps the doctor choose the most suitable allergic conjunctivitis treatment for you.

The Four Main Types

1. Seasonal Allergic Conjunctivitis (SAC)

   This is the most common type. It appears during specific times of the year, usually when there is a lot of pollen in the air, during spring, summer, or early autumn. In India, this often coincides with flowering seasons and post-monsoon weather changes. The symptoms come on quickly and can be quite intense, but they settle once the season passes or the person moves away from the trigger.

2. Perennial Allergic Conjunctivitis (PAC)

   This type is present throughout the year rather than just in certain seasons. The triggers are usually things found indoors, such as dust mites, mould, or pet dander. People with PAC have milder symptoms compared to SAC, but they deal with them continuously without clear seasonal relief.

3. Vernal Keratoconjunctivitis (VKC)

   This is a more severe type that tends to affect children and young adults, particularly boys, and is more common in warmer climates. In India, VKC is seen fairly often, especially in the hotter states. It causes intense itching, thick ropy discharge, and large bumps on the inner upper eyelid. VKC needs prompt and specific allergic conjunctivitis treatment because it can affect the cornea if not managed properly.

4. Atopic Keratoconjunctivitis (AKC)

   This type is associated with eczema and usually affects adults. It tends to be chronic and more difficult to manage, affecting both the eyelids and the surface of the eye. It requires long-term care and monitoring.

What are the Allergic Conjunctivitis Causes?

The allergic conjunctivitis cause is always an allergen, which is a substance that the body’s immune system incorrectly identifies as harmful. When this allergen comes in contact with the eyes, the immune system releases a chemical called histamine, which triggers the redness, swelling, and itching. The allergic conjunctivitis cause varies from person to person, which is why two people exposed to the same environment may have very different reactions.

Understanding the allergic conjunctivitis causes in your specific case is important, because avoiding the trigger is one of the most effective ways to reduce the frequency and severity of episodes, alongside medical allergic conjunctivitis treatment.

Common Allergic Conjunctivitis Causes

Pollen Tree, grass, and weed pollen are among the most common seasonal allergic conjunctivitis causes in India. Levels are highest in spring and the post-monsoon period, which explains why many people notice their symptoms flaring during these times.

Dust and dust mites

House dust mites live in mattresses, pillows, carpets, and curtains, and they are a very common year-round allergic conjunctivitis cause. In Indian homes, where ventilation may vary and carpets are common, dust exposure can be significant.

Pet hair and dander

Proteins found in the skin flakes, saliva, and urine of cats and dogs can trigger eye allergies. This is a common allergic conjunctivitis cause in households where pets are kept indoors.

Air pollution and smoke

India’s urban air quality, particularly in cities, adds to the burden of eye allergies. Smoke from vehicles, factories, and burning crop stubble is a major environmental trigger.

Mould and fungal spores

Mould grows in damp areas and releases spores that can irritate the eyes, especially during the monsoon season.

Cosmetics and eye products

Some eye creams, kajal, eyeliner, and even certain eye drops can trigger a local allergic reaction. This is a particularly common allergic conjunctivitis cause in women.

Contact lens wear

People who wear contact lenses are at higher risk. Proteins and allergens can accumulate on lens surfaces and irritate the conjunctiva over time.

How Do Doctors Diagnose Allergic Conjunctivitis?

Diagnosing allergic conjunctivitis does not usually require complex tests. In most cases, the doctor can identify it through a clinical eye examination and a few straightforward questions about your history and triggers. What the doctor is mainly trying to establish is whether the eye allergy is simple and seasonal, or whether it is a more persistent type that needs closer monitoring.

What the Doctor Looks For?

Allergic Conjunctivitis Treatment: What Are Your Options?

Allergic conjunctivitis treatment aims to relieve the symptoms, reduce inflammation, and where possible, limit exposure to the trigger. The right allergic conjunctivitis treatment depends on the type of allergy, how severe the symptoms are, and how long the person has been dealing with the condition. In many cases, a combination of measures works better than any single approach.

The most important thing to understand is that rubbing the eyes, while it feels relieving in the moment, actually makes the reaction worse by releasing more histamine. This is something the doctor will always advise against as part of any allergic conjunctivitis treatment plan.

Allergic Conjunctivitis Treatment Options

1. Avoiding the Trigger First and most important step The most direct way to manage eye allergic conjunctivitis treatment is to reduce exposure to the allergen causing it. This means keeping windows closed during high-pollen days, washing hands and face after coming in from outside, using dust mite-proof covers on pillows and mattresses, keeping pets out of the bedroom, and removing eye makeup thoroughly each night. This does not always eliminate the problem entirely, but it reduces how often and how severely episodes occur.
2. Cold Compress Safe, immediate relief at home Placing a clean, cool, damp cloth over closed eyes for a few minutes can help reduce swelling and provide relief from itching without any medication. This is particularly useful for mild symptoms and for children. It is a safe first step while you arrange to see a doctor.
3. Antihistamine Eye Drops First-line medical treatment These are the most commonly prescribed eye drops for allergic conjunctivitis treatment. They work by blocking histamine, the chemical that causes itching, redness, and swelling. They are available on prescription and provide relief relatively quickly. Some antihistamine drops also have a mast cell-stabilising effect, which helps prevent future reactions if used regularly before exposure to a trigger.
4. Mast Cell Stabiliser Eye Drops Preventive treatment These drops work by preventing the immune cells in the eye from releasing histamine in the first place. They are more effective when started a couple of weeks before the allergy season begins, rather than after symptoms have already started. For people with seasonal allergic conjunctivitis, this is a useful preventive approach.
5. Lubricating Eye Drops (Artificial Tears) Washout and relief These drops help wash out allergens from the eye surface and reduce dryness and irritation. They are safe for regular use and can be used alongside other eye drops as part of the allergic conjunctivitis treatment plan. Preservative-free options are available for those with sensitive eyes.
6. Oral Antihistamine Tablets When symptoms affect the nose and eyes together When allergic conjunctivitis occurs alongside a runny nose, sneezing, or other allergy symptoms, an oral antihistamine tablet can address all of them together. These are available over the counter and are safe for most adults and children, though the doctor will advise the appropriate one based on age and medical history.
7. Steroid Eye Drops For severe or persistent cases only In more severe types of allergic conjunctivitis, such as VKC or AKC, or when symptoms do not respond to other treatments, a short course of steroid eye drops may be prescribed. These are effective at reducing inflammation quickly, but they need to be used under medical supervision, as long-term use can raise eye pressure and increase cataract risk.
8. Allergen Immunotherapy Long-term management for specific cases For people who have severe, recurring allergic conjunctivitis that does not respond well to standard treatments, allergen immunotherapy (also called desensitisation) can be considered. This involves gradually exposing the body to increasing amounts of the allergen over time, training the immune system to stop overreacting to it. It is not a first-line treatment but can provide long-term relief for the right patients.

Allergic Conjunctivitis Treatment at a Glance

RELATED EYE CONDITIONS

• Dry Eye Syndrome
• Vernal Keratoconjunctivitis
• Keratoconus
• Bacterial Conjunctivitis
• Blepharitis

REFERENCES

1. Cleveland Clinic. Allergic Conjunctivitis: Causes, Symptoms and Treatment. Last reviewed 2023.
   https://my.clevelandclinic.org/health/diseases/allergic-conjunctivitis
2. Baab S, Le PH, Gurnani B, Kinzer EE. Allergic Conjunctivitis. StatPearls, National Library of Medicine. Updated January 2024.
   https://www.ncbi.nlm.nih.gov/books/NBK448118/
3. American College of Allergy, Asthma and Immunology. Eye Allergy.
   https://acaai.org/allergies/allergic-conditions/eye-allergy/
4. Leonardi A, et al. Allergic conjunctivitis: a comprehensive review of the literature. Life (MDPI). 2024;14(6):650.
   https://www.mdpi.com/2075-1729/14/6/650
5. Moorfields Eye Hospital NHS Foundation Trust. Allergic Conjunctivitis: Patient Guide.
   https://www.moorfields.nhs.uk/ae/patient-guides/allergic-conjunctivitis

For appointments, call 1800 571 2222 or visit your nearest Vasan Eye Care centre.