Associations of atopic keratoconjunctivitis include all except:
**Core Concept**
Atopic keratoconjunctivitis (AKC) is a chronic and severe form of allergic conjunctivitis characterized by inflammation of the conjunctiva and cornea. It is a manifestation of atopy, often associated with other allergic conditions such as asthma and eczema.
**Why the Correct Answer is Right**
AKC is associated with a range of systemic and ocular comorbidities, including asthma, rhinitis, and eczema. The pathophysiology of AKC involves an imbalance in the immune response, leading to the release of pro-inflammatory cytokines and the activation of eosinophils. This results in the characteristic symptoms of AKC, including itching, redness, and vision disturbance.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because asthma is a well-established comorbidity of AKC, often occurring in the same patients.
**Option B:** This option is incorrect because eczema is another common comorbidity of AKC, often part of the same atopic diathesis.
**Option D:** This option is incorrect because vernal keratoconjunctivitis (VKC) is a distinct entity, although it shares some clinical features with AKC.
**Clinical Pearl / High-Yield Fact**
AKC is often associated with a more severe prognosis than other forms of allergic conjunctivitis, particularly if left untreated. Early recognition and management are essential to prevent permanent vision loss.
**Correct Answer: C. Vernal keratoconjunctivitis.**