Hi. I'm online and happy to answer your question today.
The "base" that the ear medication is dissolved in causes irritation
to the eye. This is why his eye is red.
The good news? No permanent damage has been done and he will no long term problems from this error. As a matter of fact, the antibiotic in the ear drop probably worked to help kill his eye infection even while the "base" the drug was dissolved in irritated his eyeball.
At this point I suggest he use artificial tears to soothe his eye along with cold compresses. If he just put in a drop of the ear medicine in his eye then he should flush the eye with water -- but from your post it seems like he used the ear drops awhile ago....
Do not use visine to "get the red out" This will just irritate his eye more.
So. What is the take home message? Everything will be OK. He can start using the correct eye preparation of his medicine now without any problems.
Is there anything else you would like to discuss at this point or have all your questions been answered to your satisfaction?
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Thanks in advance,
Dr. Rick MD FACS