MSFinals-3779
A 36-year-old swim instructor arrives at the Emergency Department complaining of severe pain in his right eye and feeling like there is something foreign in it, even though he has already removed his contact lenses. Upon examination, the right eye shows conjunctival injection, and the patient experiences photophobia, tearing, and discharge. His visual acuity is 6/6 in the left eye and 6/12 in the right eye, with intact ocular reflexes. A slit lamp inspection reveals mild, regular ulceration in the right eye. What is the most probable diagnosis?