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Topical numbing medicines are generally discouraged for management of corneal abrasions, but low concentrations and doses are probably better tolerated. Higher concentrations of topical anesthetics appear to impair healing of the cornea.
There is some use of topical anesthetics in people that are having pain that is not well controlled by oral medicines, but it is better to be using an ophthalmic preparation of a lower concentration, and also usually a longer acting medicine than the lidocaine, such as tetracaine.
At this point, it would be better to continue the treatment prescribed by the ER doctor. If the Vicodin is not doing well at controlling the pain, then it would be better to contact an Ophthalmologist for a lower concentration topical anesthetic in an ophthalmic preparation than to use the lidocaine that you have for suturing.
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I am an ophthalmologist
And I just want to say that, as Dr. Love said above, putting any sort of anesthetic agent on a corneal abrasion is ABSOLUTELY the worst possible thing that you can do.
All anesthetic agents are toxic to the cornea and can cause the epithelium to stop growing across the wound. Unfortunately, in the last two decades of practice I have treated a number of patients who have put numbing drops on their wounded eye -- I will never forget the one enuculeation I had to do because of it.....
If it hurts that much a tight pressure patch can help.
Does this make sense to you?
Please, if you are going to give positive feedback for the help you received on this issue, make sure that you give Dr. Love excellent feedback not me -- I'm just "chiming in" ;)