Method and device for treating vision impairment

A wearable optical device for a human subject, comprising:

• a. a transparent lens having a distal surface and a proximal surface;
• b. a wearable frame configured, when worn by a human subject, to maintain said proximal surface of said lens in front of a first eye of the subject at a distance of not less than 5 mm and not more than 50 mm from the surface of the cornea of the first eye so that at least part of the visual field of the first eye is covered by said lens when the gaze direction of the first eye is straight ahead;
• c. a transparent pixelated active optical element comprising at least 100 independently-addressable pixels, each one of said pixels having an optical property with a changeable value, the active optical element physically associated with said frame and/or said lens that at least part of the visual field of the first eye is covered by both said lens and said active optical element;
• d. an eye tracker configured to determine and report the gaze direction of the first eye;
• and
• e. a controller having a digital memory configured to:
• i. receive from said eye-tracker a determined gaze direction of the first eye;
• and
• ii. at a repetition rate, set a value for a said optical property of said at least 100 pixels of said active optical element so as to create an image mask through which at least some of the light reaching the first eye passes through, thereby modifying the image formed on the retina of the first eye,
• wherein said value for a said optical property is based on a received gaze direction and the optical power of said, and
• wherein said controller said lens and said active optical element are together configured so that during operation of the optical device, at least a portion of the visual field of the first eye is degraded by the optical power of said lens and/or by said created image mask.