Are you sure you use the right eye drops that good for your eyes? If so, it won't cause hurt in the eyes. Or it may causes by letting the bottleneck of eye drops contact your eyes directly that cause scratches on the surface of your eyes. If so, you shall practice more how to put eye drops in your eyes. Just let your your eyes open as wide as you can with the help of your finger. And then the other hand hold the bottle and apply eye drops in the corner of the eyes that near the bridge of the nose. Please remember that never let the bottleneck contact your eyes directly.
