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Look at the size of the Bijuu, these 9 Bigass, Enormous, Humongous Gigantic, Skyscraper Sized Creatures.
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Sasuke casted Genjutsu on all them at the same time, and the Sage confirmed it was with a single glance.
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Given their size and location, there's no way that he could have gotten all of them with a single glance by making eye contact with each of them one by one especially at the exact same time.
The only logical explanation is that the Tomoe Rinnegan can cast Genjutsu without eye contact, which is another similarity it has with the Rinne-Sharingan, which casted the Infinite Tsukuyomi that doesn't require eye contact.
Only the Sharingan was stated to need eye contact to cast. Sasuke is the only one to cast Genjutsu with the Rinnegan, and unlike the Sharingan, knowledge of it's capabilities weren't well known due to a long history of people with it's abilities. So the same rules that apply for the Sharingan aren't guaranteed to apply for the Rinnegan.