An optical system for use in an augmented reality imaging system , the optical system comprising: an image generator for generating an augmented image and a collimating module focusing the augmented image to infinity, a light directing device comprising a light transmitting waveguide configured for directing input light by total internal reflection conditions, including light indicative of the collimated augmented image to be projected and input light indicative of a real image of an external scene, to propagate to an eyebox; a projecting optical device having a fixed profile of optical properties and having a plurality of different optical powers at different regions thereof corresponding to different vision zones within said field of view, said projecting optical device being configured to affect propagation of at least one of light indicative of the augmented image and light indicative of the real image, such that, for each of said different regions, interaction of a part of said light indicative of the augmented image and a part of said light indicative of the real image with said region directs said part of said light indicative of the augmented image and said part of the light indicative of the real image along a substantially common output propagation path, corresponding to the optical power of said region, thereby providing in-focus images in said eyebox for said part of the light indicative of the augmented image and said parts of the light indicative of the real image of the external scene, wherein said different vision zones are defined by different regions of the projecting optical device, such that when the optical system is in use, user's line of sight in its different angular orientations intersect with said different regions, wherein said projecting optical device is configured to affect light propagation therethrough such that a virtual focal plane (FP) is created, which is slanted with respect to an optical axis of the optical system . an image generator for generating an augmented image and a collimating module focusing the augmented image to infinity, a light directing device comprising a light transmitting waveguide configured for directing input light by total internal reflection conditions, including light indicative of the collimated augmented image to be projected and input light indicative of a real image of an external scene, to propagate to an eyebox; a projecting optical device having a fixed profile of optical properties and having a plurality of different optical powers at different regions thereof corresponding to different vision zones within said field of view, said projecting optical device being configured to affect propagation of at least one of light indicative of the augmented image and light indicative of the real image, such that, for each of said different regions, interaction of a part of said light indicative of the augmented image and a part of said light indicative of the real image with said region directs said part of said light indicative of the augmented image and said part of the light indicative of the real image along a substantially common output propagation path, corresponding to the optical power of said region, thereby providing in-focus images in said eyebox for said part of the light indicative of the augmented image and said parts of the light indicative of the real image of the external scene, wherein said different vision zones are defined by different regions of the projecting optical device, such that when the optical system is in use, user's line of sight in its different angular orientations intersect with said different regions, <EOS>