Using an allergen-reducing eye drop during allergy season may help 'get the red out' and sooth itchiness, but daily use can actually make the problem worse.
It can cause something called rebound redness, which results in excessive eye redness because eyes no longer respond to
eye drops.
Allergen-reducing eye drops work by constricting the blood flow to the cornea,
which deprives it of oxygen.
So while your eyes don't feel inflamed and itchy anymore, they're actually not getting enough oxygen from blood. That's not ideal,
because the eye muscles and tissues need oxygen to function.
The lack of oxygen can even result in swelling and scarring.
Source: m.wikihow.com
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