This ophthalmologist really isn't popular. It's Saturday, but there aren't that many people.
ご質問ありがとうございます。
"This ophthalmologist really isn't popular."=「この眼科医は本当に流行っていないわ。」
"It's Saturday, but there aren't that many people."=「土曜日なのに、あまり人が多くない。」
追加情報:optometristという単語もありますが、ophthalmologist(眼科医)と違って「検眼士」という意味になります。
ご参考に。