A head-mounted display device (100; 800), comprising: a frame comprising a cavity ; a virtual image display device coupled to the frame and configured to generate virtual image light for causing a user to perceive visual content; and an optical system that is selectively removably insertable into the cavity of the frame and, when inserted into the cavity , the optical system is located along an optical path of rays of the virtual image light , the optical system comprising: a first correcting portion (212; 712) having a left optical subsystem and a right optical subsystem , each of the left and right optical subsystems of the first correcting portion (212; 712) including: one or more actuators ; and a first set of lenses positioned at a first location along the optical path and having first optical characteristics correcting for a first set of vision conditions, at least one of a first lens and a second lens of the first set of lenses being selectively adjustable relative to the other of the first lens and the second lens of the first set of lenses , via the one or more actuators , along a first axis transverse to the optical path to modify the first optical characteristics; and one or more electrical contacts exposed on an exterior surface of the optical system , the one or more electrical contacts sized and shaped to engage with corresponding electrical contacts within the cavity of the frame to establish an electrical connection through which signals and power may be transmitted to the one or more actuators of the optical system . a frame comprising a cavity ; a virtual image display device coupled to the frame and configured to generate virtual image light for causing a user to perceive visual content; and an optical system that is selectively removably insertable into the cavity of the frame and, when inserted into the cavity , the optical system is located along an optical path of rays of the virtual image light , the optical system comprising: a first correcting portion (212; 712) having a left optical subsystem and a right optical subsystem , each of the left and right optical subsystems of the first correcting portion (212; 712) including: one or more actuators ; and a first set of lenses positioned at a first location along the optical path and having first optical characteristics correcting for a first set of vision conditions, at least one of a first lens and a second lens of the first set of lenses being selectively adjustable relative to the other of the first lens and the second lens of the first set of lenses , via the one or more actuators , along a first axis transverse to the optical path to modify the first optical characteristics; and one or more electrical contacts exposed on an exterior surface of the optical system , the one or more electrical contacts sized and shaped to engage with corresponding electrical contacts within the cavity of the frame to establish an electrical connection through which signals and power may be transmitted to the one or more actuators of the optical system . one or more actuators ; and a first set of lenses positioned at a first location along the optical path and having first optical characteristics correcting for a first set of vision conditions, at least one of a first lens and a second lens of the first set of lenses being selectively adjustable relative to the other of the first lens and the second lens of the first set of lenses , via the one or more actuators , along a first axis transverse to the optical path to modify the first optical characteristics; and one or more electrical contacts exposed on an exterior surface of the optical system , the one or more electrical contacts sized and shaped to engage with corresponding electrical contacts within the cavity of the frame to establish an electrical connection through which signals and power may be transmitted to the one or more actuators of the optical system . <EOS>