Instead of finding out what we thought was the case — that blindness was caused mostly by glaucoma and trachoma — we were astounded to find out that blindness was caused instead by cataract.
En lugar de encontrar lo que pensábamos — que la ceguera era causada en su mayoría por glaucoma y tracoma — nos sorprendimos al encontrar que la ceguera era en realidad causada por cataratas.