Which skin condition is highly contagious and primarily affects the eyes?

The condition that is highly contagious and primarily affects the eyes is conjunctivitis, commonly known as pink eye. Conjunctivitis can be caused by bacterial or viral infections, as well as allergens and irritants. When it is viral or bacterial, it spreads easily among individuals, especially in close contact environments such as schools or daycare centers. The defining characteristics of conjunctivitis include redness, swelling, discharge, and discomfort in the affected eyes, which can also lead to tearing and a gritty feeling.

Pustules and papules are different skin lesions; pustules contain pus and may occur in various skin conditions but are not specifically linked to eye infections. Impetigo is a highly contagious skin infection primarily affecting the surface of the skin but does not primarily target the eyes. Thus, conjunctivitis is the correct answer, as it directly relates to a contagious condition that primarily involves the eyes.