On the first day, the rats were sensitized by injecting 0.6 ml of (0.9% NaCl) normal saline comprising alum (4 mg) and ovalbumin (2 mg) into four-foot pads. They were boosted five days later with a subcutaneous injection of 1 ml of normal saline comprising ovalbumin (2 mg) at ten locations on the back. Later, from day 8 to 15 d, local sensitization was performed by instilling ovalbumin in normal saline (30 µl) per site into bilateral eyes with a micropipette, and the symptoms were assessed.