Moorfields In this condition the surface of the eye becomes red and sore and inflamed. This is a type of allergic eye disease, and is similar to vernal conjunctivitis and giant papillary conjunctivitis. The immune system becomes overactive; a type 2 hypersensitivity reaction. The cause is not known, but it is partly genetic. There are environmental factors we partly understand, and these are discussed below.
The condition affects the conjunctiva, the cornea, and the conjunctiva under the eyelids.
enlarge the anatomy
enlarge the problems
The condition causes inflammation of the surface of the eye. The conjunctiva (the skin covering the eye) can develop tiny lumps, limbitis. In addition, the under surface of the upper lid also becomes inflamed. The eye is very red and itchy to start with. When the condition is very active, it is very hard to open the eyes.
If the condition is not treated, the eye becomes very dry, and corneal scarring can reduce the sight. Corneal ulcers can develop, and later also scars. Later and the cornea and the undersurface of the upper lid can become scarred. Lids become thickened, lashes are lost, and there may be an ectropion with epiphora (watering). It tens to affect the upper lid with giant papillae, but these disappear if chronic., and the conjunctiva is scarred. The lower corneal surface may be damaged because of the lid problems, and there may be relentless corneal vascularisation. As with VKC, herpes simplex infection may occur, and also keratoconus.
The condition tends to begin as an adult, and can continue for many years.
Wide range of allergens trigger the inflammation, but often staph aureus. Patients may develop secondary bacterial or viral infections (geographic hsv ulcers in absence even of steroids), or rearely squamous cell conjunctiva. There is loss of lashes. There may be large corneal plaques.
This page outlines different treatments. If the condition is severe, advice from an ophthalmologist is essential. Anyone with sore eyes should ideally not use more than 4 eye drops a day containing preservative; if more drops are needed, they should be preservative free.
Optichrom eye drops are virtually 100% safe for long term use and can be very helpful. They stop the 'allergy cells' on the surface of the eye, the mast cells, releasing chemicals that make the eyes irritable. Nedocromil (Rapitil) and Lodoxamide are more modern and quicker acting forms of Optichrom and should tried if Optichrom has not helped enough. They are generally not helpful for patients attending hospital clinics as their condition is more severe.
Bactroban for lids
These are make the surface of the eye smooth. For mild disease Viscotears or Xailin gel 4 times a day may help. Xailin night may help at night.
Most patients attending hospital will need more intensive lubricant drops
Antihistamine tablets such as Cetirizine , Levocetirizine (5mg >6y age), Loratidine Others. They may make you too tired but are
There are many types of antihistamine tablets and some make more people tired than others. Ask your doctor and pharmacist for advice. If you have many episodes of AKC and find this helps, start these as soon as the eyes get sore.
Most hospital patients will need steroid eye drops, and these should be preservative free, such as dexamethasone preservative free e.g. Dropadex. They should not be used without an ophthalmologist's advice, unless your GP is experienced in their use and you only use them for short periods.
They have side effects, such as increasing the eye pressure, (causing glaucoma) and cataracts (which may need surgery later). Even short term use of steroid drops can activate herpes simplex keratitis.
If the eyes are red and sore and itchy, start 4 times a day. As soon as the redness fades, usually about 4 days, start to reduce the dose of the steroid to 3 and then twice a day. Once the redness has faded, continue for a few more days and then try to stop them.
If the redness and itch returns every time you stop, and as advised by
your ophthalmologist, you may need to use a low dose regularly, such
as once a day, and later alternate day use, or every third day etc, and then stopping.
Steroid drops have many side effects if used in the wrong manner. You need to be certain that you do have 'allergic conjunctivitis' and not another condition, and most people can recognise when their eyes are red and itchy the condition has returned.
If you have a scratchy and painful eye, you may have an ulcer and the drops should be stopped and you should get expert advice.
Tacrolimus ointment 0.03 % twice day (Protopic) to skin around eye cream twice takes a few weeks to work, so it should be started whilst the patient is using the steroid drops, with a maximum effect at 6 months, although there should be a definite improvement after 4 weeks. Some of the Protopic ointment should be allowed to enter the eye (otherwise there will be no effect on the conjunctiva).. It does sting.
Once the Protopic is working, the dose of the steroid drops can be reduced and may be stopped or continued at a low dose (reducing from 4 times a day to once a day or less often perhaps).
When the Protopic is started it stings for a few days, but the stinging effect wears off. see see tacrolimus
Pulsed methylprednisonolone and long term immunosuppresion
People with allergic eye disease may be sensitive to dust, and the measures below may help. (This includes a few patients with AKC)
If you have a dust allergy there is plenty you can do. Visit the websites below for more details. This page has many details....although written for asthma patients, advice may be helpful.
Lifestyle issues are critically important for patients with AKC