what was the medication that patient 16066 was prescribed for the last time through the left eye route until 03/2104?
select prescriptions.drug from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 16066 ) and prescriptions.route = 'left eye' and strftime('%y-%m',prescriptions.startdate) <= '2104-03' order by prescriptions.startdate desc limit 1