1 doctor weighed in:

Is too much opcon-a or naphcon-a eye drop use bad for you? How much is too much?

1 doctor weighed in
Dr. Clement Cheng
Ophthalmology

In brief: Yes

Both these drops are vaso-constrictors that constrict the blood vessels on the surface of the eye.
They should only be used for a short time. Long term usage can cause rebound vaso-congestion which results in worsening redness in the eyes when the drop is not used. Using it more than a few times a day for a few weeks is likely too long.

In brief: Yes

Both these drops are vaso-constrictors that constrict the blood vessels on the surface of the eye.
They should only be used for a short time. Long term usage can cause rebound vaso-congestion which results in worsening redness in the eyes when the drop is not used. Using it more than a few times a day for a few weeks is likely too long.
Dr. Clement Cheng
Dr. Clement Cheng
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