Mrs Jones is a 29 year old lady who has booked an emergency GP appointment today as she is worried about her left eye. Yesterday, whilst changing her daughter’s nappy she thinks she might have scratched her eye. Since then her eye has been sore and teary. Her other eye is not affected and her vision is normal.
Her observations are normal and examination is notable for conjunctival injection. You insert fluorescein drops which reveals a single linear area of uptake with cobalt blue light. You evert the eyelid and there is no evidence of a foreign body. Visual acuity is intact and there is no peri-orbital swelling.
Given the most likely cause of Mrs Jones’ symptoms what is the most appropriate treatment?