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How to heal a scratched cornea 
Try blinking. 
Sometimes scratches to the cornea are caused by small objects that get trapped beneath the eyelid, such as dust, dirt, sand or even an eyelash. Before you can start to treat the scratch, you must remove this foreign object.
Try blinking several times in a row to remove the object. Closing and opening your eye can stimulate the lacrimal glands to produce more tears and wash the foreign body out of the eye.