A binocular augmented reality display system comprising: a first projector with a first variable focus mechanism; a second projector with a second variable focus mechanism; a first waveguide assembly comprising: a first waveguide having an external side and an internal side a first convex lens having a first positive power arranged at the external side of the first waveguide; a first concave lens having a first negative power arranged at the internal side of the first waveguide; a first input diffractive optical element configured to receive light from the first projector and couple it into the first waveguide; a first output diffractive optical element configured to couple light out of the first waveguide toward the first concave lens; and a second waveguide assembly comprising: a second waveguide having an external side and an internal side a second convex lens having a second positive power arranged at the external side of the second waveguide; a second concave lens having a second negative power arranged at the internal side of the second waveguide; a second input diffractive optical element configured to receive light from the second projector and couple it into the second waveguide; a second output diffractive optical element configured to couple light out of the second waveguide toward the second concave lens, wherein the first and second waveguide assemblies are each configured to outcouple light toward a user in order to present a common augmented reality image to the user, wherein the system comprises a control system configured to position the common augmented reality image at a binocular convergence distance and to control the first and second variable focus mechanisms so that the common augmented reality image is provided at a focal distance which is within predetermined minimum and maximum values on either side of the binocular convergence distance and to only adjust the first variable focus mechanism and the second variable focus mechanism when the focal distance is outside of the predetermined minimum and maximum values, and wherein the predetermined minimum and maximum values are -0.25 and +0.25 dioptres of the binocular convergence distance, respectively. a first projector with a first variable focus mechanism; a second projector with a second variable focus mechanism; a first waveguide assembly comprising: a first waveguide having an external side and an internal side a first convex lens having a first positive power arranged at the external side of the first waveguide; a first concave lens having a first negative power arranged at the internal side of the first waveguide; a first waveguide having an external side and an internal side a first convex lens having a first positive power arranged at the external side of the first waveguide; a first concave lens having a first negative power arranged at the internal side of the first waveguide; a first input diffractive optical element configured to receive light from the first projector and couple it into the first waveguide; a first output diffractive optical element configured to couple light out of the first waveguide toward the first concave lens; and a second waveguide assembly comprising: a second waveguide having an external side and an internal side a second convex lens having a second positive power arranged at the external side of the second waveguide; a second concave lens having a second negative power arranged at the internal side of the second waveguide; a second waveguide having an external side and an internal side a second convex lens having a second positive power arranged at the external side of the second waveguide; a second concave lens having a second negative power arranged at the internal side of the second waveguide; a second input diffractive optical element configured to receive light from the second projector and couple it into the second waveguide; a second output diffractive optical element configured to couple light out of the second waveguide toward the second concave lens, wherein the first and second waveguide assemblies are each configured to outcouple light toward a user in order to present a common augmented reality image to the user, wherein the system comprises a control system configured to position the common augmented reality image at a binocular convergence distance and to control the first and second variable focus mechanisms so that the common augmented reality image is provided at a focal distance which is within predetermined minimum and maximum values on either side of the binocular convergence distance and to only adjust the first variable focus mechanism and the second variable focus mechanism when the focal distance is outside of the predetermined minimum and maximum values, and wherein the predetermined minimum and maximum values are -0.25 and +0.25 dioptres of the binocular convergence distance, respectively.