Are you talking about the demonic illusions? If so, both of those require sharingan and eye contact. I'm going to assume it has to be, because the only other genjutsu he has performed(outside of Tsukyomi) is that one he used on Naruto in their fight at the start of Shippuden.
Demonic illusion
魔幻・枷杭の術, Magen: Kasegui no Jutsu)
Genjutsu, Kekkei Genkai, No rank, Supplementary, Short range (0-5m)
Users: Uchiha Itachi, Uchiha Sasuke
A make-believe yoke piercing the limbs and body, completely snatching away one's freedom to move!! Once caught in the mind world created by the user, the victim will be tormented with the sensation of having wedges driven through their limbs, completely taking away their body's freedom. At the same time, the physical pain accompanying the illusion reveals the great use this technique has for primarily torture and such.
[picture of the Sharingan]
↑Performing handseals is unnecessary when all that is needed to use this technique is to have the enemy meet one's eyes!
[picture of Orochimaru being caught in this genjutsu]
↑In front of this technique, even Orochimaru is like a frog being glared at by a snake.
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The bolded part to me implies it can be used without handseals but as it said its unnecesary.... due to eye contact being a much easier and efficient method...
The keyword is unnecessary , not that it cant happen..