A variable gauge microsurgical instrument for use in ophthalmic or vitreoretinal surgery is provided herein. In one aspect, a surgical probe may include a hand piece and a probe tip attached to the hand piece. A functioning member may be at least partially disposed within the probe tip. The surgical probe may further include a sleeve configured for substantially flush-fit engagement with a first size of a surgical point of entry, such as a cannula. The sleeve may be insertable over at least a portion of the probe tip. Further, the sleeve may have an outer diameter that is larger than an outer diameter of the probe tip. In some aspects, the sleeve may be configured to be deployed and retracted with respect to the hand piece.
