Your Eyesight Should be Fine
Even though you do lots of eye rubbing when you have an allergic reaction happening, you probably aren't doing anything to actually harm your eyesight. Even so, try to go easy on your eyes -- they're a sensitive organ that you shouldn't really manhandle.
If you have the skin condition eczema, then there are rare instances that your eyesight could be affected in the long-term because of consistent inflammation. But regular allergy sufferers don't need to worry about messing up on the eye chart any time soon.