First of all, for those who are a little unsure, the cornea is the (transparent) part of the eye that covers the iris, pupil, and anterior chamber and it can be greatly damaged by dry eye syndrome.
dry eye syndrome and corneal erosion
Recurrent corneal erosion (REC) or just “corneal erosion” is an eye condition where the cornea’s outermost layer of epithelial cells do not attach to the basement membrane (ie they have been scratched or cut). Corneal nerves are exposed due to this condition, and like any nerve exposure – it is painful!
People with dry eye syndrome often have abrasions or scarring on their cornea from the lack of lubrication/hydration. The abrasions/scarring can’t be seen by the person seeing outward, or by others looking at the affected person. Corneal erosions can occur as a result of accidents where the eye has come in contact with something like a fingernail, or if the eyes have been rubbed excessively. In these instances surgery may be needed, but in this case we are talking about “slow and steady” erosions as a result of dry eye.
Signs of having REC is pain, light sensitivity, foreign-body sensation, and excessive tear production as you wake up or during sleep (REC is mostly associated with sleep). In extreme cases, on waking, the persons eyelid can feel stuck to the cornea which can be painful. Use eyedrops to separate the eyelid from the cornea to prevent erosion and or tearing. Try and wake up without opening your eyes as to not cause strain on the cornea. Have eyedrops at arms reach so you can apply them as you gently and slowly open your eyelids.
Corneal erosions are diagnosed by an eye specialist who uses an ophthalmoscope (with blue light), and the eye has a dye applied to it (as a drop). A slit lamp microscope allows for higher magnification and therefore a clearer indication of the extent of REC.
Managing corneal erosion from dry eye syndrome
REC can be managed by using eyedrops, using a humidifier (which does not blow directly towards the eyes) at home and at work, if appropriate. Cigarette smoke or wind should be avoided as this aggravates the abrasions, and the pain. Protective glasses should be worn as to make a barrier between the outside environment and the exposed corneal nerves.
People with dry eye syndrome need to stay hydrated by drinking lots of water to aid their condition and prevent further abrasions. You can apply eye ointments such as Polyvisc or Lacrilube (ideally just before bed) as development and further irritation of corneal eriosions at this time are most likely if you suffer from dry eye syndrome. 
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Never heard of this before, eww… How do I know if I have them? Can i see them?
theyre not visible without specialist equipment. If you have dry eye there is a very good chance you have them. they contribute to overall eye pain.