Figure 1. The schedule of the nasal provocation tests with allergens combined with recording of ocular features and collection of the tear samples. PBS= control nasal challenge with phosphate buffered saline; ALLERGEN= nasal challenge with allergen; INR + SICR= Immediate nasal and secondarily induced conjunctival responses; LNR + SLCR = Late nasal and secondarily induced conjunctival responses; DYNR + SDYCR =Delayed nasal and secondarily induced conjunctival responses; Arrow with solid point= recording of the NPG values (rhinomanometric parameters); Arrow with hollow point = recording of the objective ocular signs and subjective symptoms; Double crossed arrow = collection of the tear samples.