MSFinals-3806

MSFinals-3806

A 28-year-old man presents with a 5-day history of increasing pain, blurry vision and lacrimation in the left eye. He also feels a foreign body sensation in the affected eye. He had been doing some DIY work at home without wearing any goggles for the past few days prior to the onset of pain.
On examination, his visual acuities are 6/18 in the left and 6/6 in the right. The conjunctiva in the left is red. The cornea is tested with fluorescein and it shows an uptake in the centre of the cornea which looks like a dendrite. On examination of his face, there are some small vesicles at the corner of his mouth as well.
What is the most likely diagnosis?