Lucy is a 43-year-old account manager who presents with a two-day history of ‘conjunctivitis’.

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<p>Lucy is a 43-year-old account manager who presents with a two-day history of ‘conjunctivitis’.</p><p>She reports mild discomfort of the lateral aspect of the left eye with associated erythema.</p><p>There is no associated fever, URTI symptoms, photophobia, discharge or visual disturbance. There is also no history of trauma or contact lens use. She has no recent infectious contacts.</p><p>Lucy is usually well, with no past history of note and no systemic symptoms. On examination, visual acuity is 6/5 uncorrected bilaterally and pupils are equal and reactive.</p><p>The left eye (figure A) shows lateral sectoral injection with no corneal involvement. There is very mild localised tenderness of the affected area of the lateral left eye.</p><p>The right eye examines normally (figure B). Fluorescein stain reveals no ulcer or abrasion, and there is no foreign body evident on lid eversion.</p>

Dr Kate Kelso is a GP and medical editor at Australian Doctor.