Can Visine Allergy Drops dilate the pupil?

Question

Can Visine Allergy drops cause pupil dilation? I put some in only one eye and one hour later I notice that my pupil on the side where I put the drop is much bigger than the other one and my vision is a bit blurry. I put this drop because I have a redness' discharge and itching in this eye since 2 days. I had tried polysporin drops but they made it worse. The Visine Allergies drop did me a lot of good and relieved the redness and itching. However, I jumped when I saw the difference between my 2 pupils!!! Thank you for your answer Thank you for your quick response, it is much appreciated! I will go for a consultation in the next few days if it persists but this morning I am better. So I continue to monitor! Have a nice day!

Fares Ben Amara · Accepted Answer

Good evening, visine Allergy Drops contain tetrahydrozoline hydrochloride This ingredient can dilate the pupils and consequently make vision blurred Indeed, it works by reducing the blood flow in the small vessels of the eyes, which is why it is quite effective in reducing redness. But, at the same time, it increases the eye pressure and dilates the pupils And its use is not recommended for more than 3 consecutive days. Also, according to your explanation, you only have one eye affected, so it's less likely to be an allergy. Often allergies are in both eyes So, it could be a viral or bacterial infection, a foreign body, a scratch on the conjunctiva, etc If you are sure that it is an allergy, I suggest that you go see your pharmacist for drops that are more adapted for medium to long term use like Cromolyn If you are not sure and since it has been several days and the problem does not seem to be resolving, I strongly suggest that you go see an optometrist