Study to Evaluate Safety, Tolerability & PK of rhNGF in Healthy Volunteers

"Study Eye (For subjects randomized to rhNGF group) Day 1: One drop instilled into study eye (35 μL, corresponding to 0.70 μg of rhNGF).~Day 2, 3, 4, 5, 6: One drop six times a day (every 2h) into study eye (210 μL, corresponding to 4.20 μg of rhNGF).~Total dose in the study eye will be 31 drops (1085 μL, equivalent to 21.7 μg rhNGF) over 6 days."

Vehicle: formulation containing L-methionine as excipient.