He can only use these low level non visual genjutsu that he used against Naruto (crow genjutsu and ephemeral).Kakashi can also use low level genjutsu on sakura without eye contact in firsts chapters (she was the best of the team 7 with genjutsu).
Furthermore, Itachi failed to caught Kakashi with a sharingan visual eye contact genjutsu Demonic Illusion the similar sharingan genjutsu that he used against Orochimaru.You must be registered for see images
Itachi and sasuke said it too well when they fought orochimaru "all your jutsus are ineffective against these eyes".
No he can't wth? i posted the databook article for his binding illusion (the one that he used on or)
It clearly states that itachi using it with handseals is possible but unnecessary since he can cast via eye contact
It is not a unique sharingan genjutsu....only mangekyou gives those
Itachi still has his entire genjutsu arsenal..he just has to cast them like kurenai now....with handseals