Oral antihistamines give broad allergy relief and may be adequate for some ocular allergy sufferers.  However eye drops can be very useful for those individuals who:

1. Do not really have systemic allergy signs/symptoms like sneezing and congestion
2. Find that even with oral medications, ocular allergies persist
3. Find that the needed oral antihistamines dry out their eyes and create irritation or contact lens intolerance
4. Find oral antihistamines make them drowsy and was alternatives

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