What Do the Numbers on Binoculars Mean

[@nortongoback-jk8vc]

Good evening, sir! Thank you so much for reviewing the binoculars! I ordered myself from aliexpress exactly the same model Celestron-8x25! Sir please tell me how the image quality is(in the center and at the edge of the field of view)--the picture is not soapy around the edge or a little? Thanks!