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Are the crusts seen in both eyes?
crusts can be seen in case of dry eyes with meibomitis ( there can be cheesy looking pent up secretions which may harden and form crusts) or with squamous blepharitis ( inflammation of the lid margins).
A simple remedy for this is as follows-
In case you observe any flakiness of the lid margins, then you can try lid scrub with 50:50 diluted baby shampoo which will help to relieve the symptoms. In addition you can try lubricating eye drops such as refresh tears eye drops 1` drop 4 times a day for 3 weeks. You can give warm compresses twice a day to prevent the secretions from getting pent up.
Please feel free to ask follow up questions if any.
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