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If your piggy is blinking constantly every few minutes and the eye is watering a lot, then you can sure that there is either an injury like a not yet ulcerated (i.e. infected) hay poke or something scratchy stuck under an eyelid.
Checking an eye carefully whenever you notice something unusual is important as the quicker an eye injury or surface scratch is treated, the sooner and easier the eye will heal.
Right now you are learning what is normal and what not for your piggies.