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Your question is somewhat ambiguous. I don't know for certain if you are seeing grey in the corner of your visual field, or if you have seen in a mirror that there is something grey in the corner of your eyes. In the former case, this might be an early symptom of a serious condition such as retinal detachment or cataracts; if so, you should consult an optometrist and get a medical diagnosis. If you have just seen some gray substance collected in the corner of your eyes, that is probably dried mucus, which is not particularly unusual although if the quantity is abnormally great, it might be the result of an allergy of some kind, probably to pollen.

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13y ago

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