I wonder why there weren't many people wearing contact lenses.
Why were so many people wearing glasses and not contact lenses?
ーI wonder why there weren't many people wearing contact lenses.
「なんでコンタクトレンズをしている人があまりいないんだろう。」
wear contact lenses で「コンタクトレンズを着用する」
ーWhy were so many people wearing glasses and not contact lenses?
「なんでメガネの人が多くてコンタクトレンズの人が少ないの?」
wear glasses で「メガネを着用する」
ご参考まで!