## **Core Concept**
Angular conjunctivitis, also known as angular blepharoconjunctivitis, is an infection of the conjunctiva characterized by inflammation localized to the angles (or corners) of the eyes. This condition is commonly associated with specific types of bacteria.

## **Why the Correct Answer is Right**
The correct answer, *Moraxella lacunata*, is a type of Gram-negative coccobacillus that is frequently implicated in cases of angular conjunctivitis. This organism is well adapted to survive in the moist environment of the eye and can cause infection, particularly in the angular region where the tear film can be thinner and less protective.

## **Why Each Wrong Option is Incorrect**
* **Option A:** *Staphylococcus aureus* can cause various types of ocular infections, including blepharitis and conjunctivitis, but it is not the most specifically associated with angular conjunctivitis.
* **Option B:** *Haemophilus influenzae* is a common cause of conjunctivitis, especially in children, but it is not specifically linked to angular conjunctivitis.
* **Option D:** *Streptococcus pneumoniae* can cause conjunctivitis but is not the primary causative agent of angular conjunctivitis.

## **Clinical Pearl / High-Yield Fact**
A key clinical point to remember is that angular conjunctivitis is often associated with *Moraxella lacunata* and can be linked to poor hygiene or the use of shared cosmetics. Clinicians should consider this organism when diagnosing and treating angular conjunctivitis.

## **Correct Answer:** C. Moraxella lacunata