Cornea · Phlyctenular keratoconjunctivitis

Allergic conjunctivitis

Simple allergic conjunctivitis can be classified into 3 subtypes: acute, seasonal, and perennial. Additionally, allergic conjunctivitis encompasses a broad range of conditions, including seasonal allergic conjunctivitis (SAC), perennial allergic conjunctivitis (PAC), vernal keratoconjunctivitis (VKC), and atopic keratoconjunctivitis (AKC).Giant papillary conjunctivitis (GPC) is another condition that arises from contact lens use or ocular prostheses-related microtrauma. Simple allergic conjunctivitis, including acute, seasonal, and perennial forms, is an immunoglobulin E (IgE) mediated hypersensitivity reaction (Type I) triggered by direct contact between an allergen and the ocular surface. VKC is believed to involve IgE-mediated hypersensitivity and T-cell involvement in the immune response. Atopic keratoconjunctivitis appears to be a combination of delayed-type (Type IV) and immediate (Type I) hypersensitivity reactions to ocular allergen exposure. Giant papillary conjunctivitis occurs secondary to direct mechanical irritation or injury, leading to an immune response involving Type I and Type IV hypersensitivity reactions

Contributed byShadab AhmadOptometrist, Internship ( UPUMS )

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