Ocular Allergy

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Information about Ocular Allergy

Published on March 20, 2014

Author: presmedaustralia

Source: slideshare.net


Ocular Allergies- Classification, Signs and symptoms, Pathogenesis, Treatment,


CLASSIFICATION  acute conjunctival allergy  seasonal allergic conjunctivitis  perennial allergic conjunctivitis  vernal kerato-conjunctivis  atopic kerato-conjunctivis  giant papillary conjunctivitis  contact allergic conjunctivis

SYMPTOMS  itch  conjunctival hyperaemia  tearing  conjunctival oedema  mucus discharge  lid oedema  photophobia  eye rubbing  blurred vision

SEASONAL ALLERGIC CONJUNCTIVITIS  sub-acute onset  lasts days to weeks  seasonal allergens- grass, tree pollens, moulds  associated with hay-fever/allergic rhinitis  IgE mediated, type 1 allergic response  80% of patients are under 30 years of age  strong personal or family history of allergy  affects 5 to 20% of population

Cytokine regulation of the acquired immune response

ACUTE CONJUNCTIVAL ALLERGY  sudden onset eg allergy to cats  self limited- usually settles within 24hrs  conjunctival and lid oedema can be alarming to patient

PERENNIAL ALLERGIC CONJUNCTIVIS  persistent symptoms but can have seasonal spikes  triggered by house-dust mites,moulds,animal allergens  IgE mediated  mostly young adults (slightly higher prevalence in males  often personal or family history of allergy

VERNAL KERATOCONJUNCTIVITIS  a disease with some allergic components in combination with a chronic inflammatory response  comprises 2% of cases of ocular allergy  mostly affects young boys under 10 years of age  most common in hot climates  tarsal (cobblestone papillae) and limbal (trantas dots) variants  personal or family history of atopy in 50%  positive skin test in only 50%

Upper tarsal conjunctiva of patient withVKC

PATHOPHYSIOLOGY 1. Th2 lymphocytes mediate hyperproduction of IgE via Il4 . They also mediate differentiation and activation of mast cells and eosinophils via Il3 and Il5 respectively. 2. Over-expression of oestrogen and progesterone receptors in the conjunctiva of VKC patients may explain improvement with onset of puberty. 3. There may be involvement of neural factors such as substance P and NGF in pathogenesis 4. Hypersensitivity to wind, dust, sun may have a role. 5. Probable genetic component - a reduced level of tear film histaminase has been found.

CLINICAL FEATURES OF VKC  giant papillae/ trantas dots  ropy mucus discharge common  SPK and shield ulcers may be related to epithelial toxic effects of eosinophilic major basic protein, eosinophilic cationic protein and peroxidase  ptosis can occur  steroid induced glaucoma and cataract can occur

ATOPIC KERATOCONJUNCTIVITIS  associated with atopic eczema  often periocular with lid margin involvement  male predominance, age 30-50  often strong family history of allergy (atopic eczema an asthma)  can have associated ocular surface disease (conjunctival scarring, corneal PEK, corneal vascularization)  herpetic keratitis can occur in 15% of patients  keratoconus can occur in 5-15% of patients  affects 3% of population

Severe periocular and lid involvement of AKC

ATOPIC KERATO-CONJUNCTIVITIS (CONT.)  eyelid skin thickened with lichenification  can have associated punctal ectropion/ ptosis  lower fornix conjunctival papillae  potential visual loss from corneal disease, cataract, steroid, induced glaucoma  type I and type IV hypersensitivity  increased mast cells, eosinophils, CD4+ T cells (Th1 and Th2), monocytes, fibroblasts

Limbal gelatinous hyperplasia in AKC

GIANT PAPILLARY CONJUNCTIVITIS  non infectious inflammation disorder of the superior tarsal conjunctiva  named for size of papillae (> 1mm in diameter)  papillae > 0.3 mm are considered abnormal  occurrence 1 to 5% of soft contact lens wearers, 1% of hard contact lens wearers  average time of onset is 8 months for soft contact lens wearers  can occur secondary to exposed sutures, elevated subepithelial calcium plaques, ocular prosthetics  often associated history of atopy

Giant papillary conjunctivitis Advancing conjunctival thickening and papillary formation Giant papillae

SYMPTOMS AND SIGNS  early - mild irritation, scanty mucus discharge  late - blurred vision secondary to lens coating with mucus and protein - increased mucus accumulation - persistent protein body sensation - ocular itching after contact lens removal - complete contact lens intolerance

PATHOGENESIS  probably due to combined effect of mechanical trauma followed by repeated immunological presentation of foreign antigens in the form of surface deposits or environmental agents  combined type I and type IV hypersensitivity reactions  infiltration of conjunctival substantia propria by eosinophils, mast cells (T cell independent, skin type), basophils, lymphocytes and plasma cells

TREATMENT  removal of cause  change to daily wear contact lenses of RGP lenses  hydrogen peroxide disinfection probably best  more frequent enzymatic cleaning of soft lenses  topical corticosteroid in acute phase (along with contact lens discontinuation)  good prognosis

TREATMENT 1. non specific  allergen avoidance  air conditioning  cold compresses  cold artificial tears 2. topical or oral antihistamines  eg OTC Naphazoline-Antazoline 3. combined antihistamine / mast cell stabilizers  Olapatadine (Patanol)- preservative BAK  Ketotifen (Zaditen) – preservative free 4. mast cell stabilizers  Cromoglycate (Opticrom)  Lodoxamide (Lomide)

TREATMENT (CONT.) 5. topical steroid  FML  Maxidex  Prednefrin Forte 6. calcineurin inhibitors  Cyclosporine (Restasis)  Tacrolimus 7. systemic immuno supression  oral Prednisone  oral Cyclosporine 8. Plasmapheresis

QUESTIONS 1. Which of the following symptoms is associated with ocular allergy? a. itch b. tearing c. conjunctival hyperaemia d. all of the above 2. Which of the following drug is not generally used in the treatment of conjuctival allergy? a. topical antihistamine / mast cell stabilizer b. topical steroid c. topical calcineurin inhibitors d. NSAIDS 3. Which of the following can be associated with AKC and VKC? a. keratoconus b. bacterial keratitis c. glaucoma d. cataract e. all of the above

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