A surgical device, comprising: a handle assembly; an elongated portion extending distally from the handle assembly and defining a longitudinal axis (A-A); an end effector disposed adjacent a distal end of the elongated portion and configured to treat tissue, the end effector rotatable about the longitudinal axis relative to the handle assembly; a visualization device defining a visualization axis, a first portion of the visualization device extending through the elongated portion, and a second portion of the visualization device disposed at least partially within the handle assembly, the visualization device rotatable about the longitudinal axis relative to the handle assembly; and a constant horizon mechanism disposed in operative engagement with the visualization device and configured to prevent the visualization device from rotating about the visualization axis when the visualization device rotates about the longitudinal axis, the constant horizon mechanism including: an elongated tube extending through the elongated portion and disposed about the visualization device, wherein the elongated tube is fixed from rotation about the longitudinal axis relative to the visualization device; characterized in that the constant horizon mechanism further includes a first bushing, wherein the elongated tube is fixed from rotation about the longitudinal axis relative to the first bushing; and a second bushing, wherein the first bushing is disposed at least partially within the second bushing, wherein the first bushing is fixed from lateral movement relative to the second bushing, wherein the first bushing and the second bushing are disposed within the handle assembly, and wherein the second bushing is fixed from vertical movement relative to the handle assembly. a handle assembly; an elongated portion extending distally from the handle assembly and defining a longitudinal axis (A-A); an end effector disposed adjacent a distal end of the elongated portion and configured to treat tissue, the end effector rotatable about the longitudinal axis relative to the handle assembly; a visualization device defining a visualization axis, a first portion of the visualization device extending through the elongated portion, and a second portion of the visualization device disposed at least partially within the handle assembly, the visualization device rotatable about the longitudinal axis relative to the handle assembly; and a constant horizon mechanism disposed in operative engagement with the visualization device and configured to prevent the visualization device from rotating about the visualization axis when the visualization device rotates about the longitudinal axis, the constant horizon mechanism including: an elongated tube extending through the elongated portion and disposed about the visualization device, wherein the elongated tube is fixed from rotation about the longitudinal axis relative to the visualization device; characterized in that the constant horizon mechanism further includes a first bushing, wherein the elongated tube is fixed from rotation about the longitudinal axis relative to the first bushing; and a second bushing, wherein the first bushing is disposed at least partially within the second bushing, wherein the first bushing is fixed from lateral movement relative to the second bushing, wherein the first bushing and the second bushing are disposed within the handle assembly, and wherein the second bushing is fixed from vertical movement relative to the handle assembly. an elongated tube extending through the elongated portion and disposed about the visualization device, wherein the elongated tube is fixed from rotation about the longitudinal axis relative to the visualization device; characterized in that the constant horizon mechanism further includes a first bushing, wherein the elongated tube is fixed from rotation about the longitudinal axis relative to the first bushing; and a second bushing, wherein the first bushing is disposed at least partially within the second bushing, wherein the first bushing is fixed from lateral movement relative to the second bushing, wherein the first bushing and the second bushing are disposed within the handle assembly, and wherein the second bushing is fixed from vertical movement relative to the handle assembly.