It appears that you have gone offline so I will give you my answer for your perusal when you return. Yes, having a projectile like a rock flung at your eye at high velocity by heavy machinery can certainly be dangerous. This event can cause anything from a scratch on the cornea or conjunctiva (which it sounds like you may have given your symptoms), to traumatic inflammation inside the eye, bleeding inside the eye, the creation of new floaters (spots in your vision from jelly detaching from the back of the eye), tears in the retina, lacerations of the eyeball, and/or a retinal detachment.
This kind of an event is especially dangerous for someone like yourself who has already undergone some type of eye surgery, which weakens the eye forever more and makes any of these complications more likely. I think as long as your symptoms are confined to just the scratchy, irritated feelings you're having, you can continue to use the Systane artificial tears to lubricate the eye and observe this. If you are having significant vision loss, if you see floating dots or spots in the vision that may or may not be accompanied by flashing or arcing lights, if you have significant eye redness and pain, or if you notice a curtain or veil in the periphery of your vision that you can't see through, then these are reasons to see your eye doctor ASAP.
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.