Sakura Binoculars Can Anyone Tell Me How To Tell A Good Quality Pair Of Binoculars!!?

Can anyone tell me how to tell a good quality pair of binoculars!!? - sakura binoculars

Hello I have a pair of binoculars - Sakura 10-90x80. They are very heavy and unwieldy, so I tried to buy a compact year. Can someone tell me, are the ones that I have a good quality? If so I'll buy a compact pair of numbers. Or can you recommend a good pair of strong light Me.For Birding mainly / Long Distance ............ Thank you .....