A wearable augmented reality head-mounted display system (60, 250) configured to pass light from the world forward a wearer wearing the head-mounted system (60, 250) into an eye (210, 220) of the wearer, said wearable augmented reality head mounted display system (60, 250) comprising: an optical display (70, 520, 2000) configured to output light to form an image; one or more waveguides (260, 660, 2700, 2904) disposed to receive said light from said display (70, 520, 2000); a frame configured to dispose the one or more waveguides (260, 660, 2700, 2904) forward of said eye (210, 220) such that said one or more waveguides (260, 660, 2700, 2904) have a forward side and a rearward side, said rearward side closer to said eye (210, 220) than said forward side; a variable power reflector (1032, 3004) disposed on said forward side of said one or more waveguides (260, 660, 2700, 2904), said variable optical power reflector (1032, 3004) configured to have an optical power that is adjustable upon application of an electrical signal; and one or more out-coupling elements (570, 580, 590, 600, 610, 800, 810, 820) disposed with respect to said one or more waveguides (260, 660, 2700, 2904) to extract light from the one or more waveguides (260, 660, 2700, 2904) and direct at least a portion of said light propagating within said one or more waveguides (260, 660, 2700, 2904) to the variable power reflector (1032, 3004), said light extracted from said one or more waveguides (260, 660, 2700, 2904) being redirected by said variable power reflector (1032, 3004) back through said one or more waveguides (260, 660, 2700, 2904) and into said eye (210, 220) to present an image from the display (70, 520, 2000) into the eye (210, 220) of the wearer. an optical display (70, 520, 2000) configured to output light to form an image; one or more waveguides (260, 660, 2700, 2904) disposed to receive said light from said display (70, 520, 2000); a frame configured to dispose the one or more waveguides (260, 660, 2700, 2904) forward of said eye (210, 220) such that said one or more waveguides (260, 660, 2700, 2904) have a forward side and a rearward side, said rearward side closer to said eye (210, 220) than said forward side; a variable power reflector (1032, 3004) disposed on said forward side of said one or more waveguides (260, 660, 2700, 2904), said variable optical power reflector (1032, 3004) configured to have an optical power that is adjustable upon application of an electrical signal; and one or more out-coupling elements (570, 580, 590, 600, 610, 800, 810, 820) disposed with respect to said one or more waveguides (260, 660, 2700, 2904) to extract light from the one or more waveguides (260, 660, 2700, 2904) and direct at least a portion of said light propagating within said one or more waveguides (260, 660, 2700, 2904) to the variable power reflector (1032, 3004), said light extracted from said one or more waveguides (260, 660, 2700, 2904) being redirected by said variable power reflector (1032, 3004) back through said one or more waveguides (260, 660, 2700, 2904) and into said eye (210, 220) to present an image from the display (70, 520, 2000) into the eye (210, 220) of the wearer.