Lallo, 25 year old man, presented with history of pain, redness and watering of left eye for last 1 day. There is also intolerance to light. Most probable diagnosis is:

Symptoms of keratitis: Pain and foreign body sensation occurs due to mechanical effects of lids and chemical effects of toxins on the exposed nerve endings Watering of the eye occurs due to reflex hyperlacrimation Photophobia, i.e., intolerance to light results from stimulation of nerve endings Blurred vision results from corneal haze Redness of eyes occurs due to congestion of circumcorneal vessels Ref: Comprehensive Ophthalmology by AK Khurana, 4th edition, Page 95.