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Common problem with binoculars after a knock. One of the prisms has shifted, putting them out of collimation (alignment). If they are very high quality or collectible they might be worth fixing. It is likely to be expensive. I have done a few pair myself, but only when it was uneconomic to have it done professionally (I have ruined a few too).
Send them back to Nikon. The first pair i had did it twice, then they sent me a brand new pair. Here a year later with new pair the eyecup pieces that turn in and out already have cracks in them again.
The Kestrel should have rubber eyecups. They are fairly thick and stiff but these need to be folded over to be used with glasses.
If that isn't working for you you could try this. Some who wear glasses remove the eyecups. The rubber unscrews. The eyecup is then replaced with the rubber from a bicycle inner tube. Stetch the inner tube over where the eyecups were sitting. This can be cut and folded to the right height to allow viewing with your glasses.
Just removing the eyecup and using glasses may result in you scratching your glasses on the metal eyepiece.
Do you mean the Swift Audubon 8.5x44? If so, for the new model 820 contact Swift Sports Optics. If it's the older model 804 ask around in the forums such as Cloudy Nights. The new model 820 is rubber coated. The old models have a grey crinkle finish.
What an excellent glass you have. Nikon in your country should have a service center. I have had them get me a replacement set for a 7x50IF SP WP which is not a common model. They emailed me an order form and I emailed it back. They were not in stock so it takes about 6 to 8 weeks. May I suggest you order a back up set when you do.
If they aren't too helpful (they needed a shove) try Binoculars.com or Adorama Camera in new York. They will also ship internationally.