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how long have you been using contacts (years) ? do you wear them all day ? do your eyes feel dry or irritated at the end of the day ? is there any discharge from the eyes ?
the lack of discharge from the eyes really points to a problem other than a pink eye. The antibiotics probably would have taken care of that issue as well. Having worn decades for 2 decades, it is possible that you are developing a dry eye syndrome due to contact lens wear and you may need to be using lubricants through out the day to help keep your eyes from becoming irritated. In addition, I recommend using the contacts for a shorter duration throughout the day. I do recommend a visit to the ophthalmologist to check your eyes and evaluate the surface for what I suspect. I wish you well, Dr. Stevens