What is keratoconjunctivitis associated with vernal keratoconjunctivitis?

Keratoconjunctivitis associated with vernal keratoconjunctivitis is primarily characterized as a seasonal eye allergy. This condition usually manifests in individuals during certain times of the year, particularly in spring and summer, when allergenic substances such as pollen are more prevalent in the environment.

In vernal keratoconjunctivitis, the immune system overreacts to allergens, resulting in symptoms like itching, redness, tearing, and mucous discharge due to inflammation of both the conjunctiva and cornea. The seasonal aspect of this allergic response is a key feature, as symptoms typically correlate with specific environmental changes, confirming its classification as an allergic condition rather than an infectious or irritative process.

The other options represent distinct conditions that do not align with the mechanisms or characteristics of vernal keratoconjunctivitis. For instance, an infection of the cornea pertains to microbial keratitis, while chronic inflammation of the eyelids relates to blepharitis. Contact lens-related irritation involves discomfort due to lens wear, which can produce symptoms similar to allergies but is not specifically linked to the seasonal nature of vernal keratoconjunctivitis. Thus, option C is accurately identified as the correct choice.