Adverse drug reactions are appreciably harmful or unpleasant reactions resulting from an intervention related to the use of medical products, which predicts hazard from future administration and warrants prevention or specific treatment, or alteration of the dosage regimen, or withdrawal of the product. Given medical case reports extracted from MEDLINE, the task is to classify whether the case report mentions the presence of any adverse drug reaction. Classify your answers into non-adverse drug event and adverse drug event.

The images obtained were compared with images from patients without corneal disease.
non-adverse drug event
The report describes an imaging technique called specular microscopy that can be used to inspect the cornea. There is no mention of any adverse drug reaction in the case report. So, the answer is non-adverse drug event.