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.
Em vez de descobrirmos o que julgávamos ser o caso — que a cegueira era provocada sobretudo pelo glaucoma e pelo tracoma — ficámos estupefactos ao descobrir que a cegueira era causada sobretudo pelas cataratas.