Volo's eye EA - Official Launch change
The eye can no longer be pickpocketed early. It no longer gives a -1 to Int and +1 to Wis, but instead gives a permanent "see invisibility" buff that forces a dex saving throw on invisible character, or else they lose invisibility.
Additionally, a character with hag eye cannot receive this eye, the character will insist they only have one good eye left and refuse the procedure.