Methods and systems for controlling an object using a head-mounted display

A method of controlling an object using a head-mounted display, the method comprising:

• determining, with an electronic processor, a depth of field measurement of an eye based on information received from an eye tracking assembly monitoring the eye;
• determining, with the electronic processor, that the depth of field measurement is greater than a predetermined distance, wherein the predetermined distance is within a range of measurable depth of field measurements of the eye and wherein determining that the depth of field measurement is greater than the predetermined distance indicates that the depth of field measurement is outside the range of measurable depth of field measurements;
• and
• controlling, with the electronic processor, a display projector to project a virtual line in response to determining that the depth of field measurement is greater than the predetermined distance, the virtual line being projected such that a length of the virtual line corresponds to the range of measurable depth of field measurements of the eye.

An apparatus, comprising:

• an eye tracking assembly configured to determine eye gaze of an eye and determine a depth of field measurement of the eye based on a lens distortion of the eye;
• a display projector coupled to the eye tracking assembly, wherein the display projector projects a virtual depth guidance element in response to the depth of field measurement exceeding a predetermined threshold,
• wherein the predetermined threshold is a predetermined distance within a range of measurable depth of field measurements of the eye,
• wherein the depth of field measurement exceeding the predetermined threshold indicates that the depth of field measurement is outside the range of measurable depth of field measurements of the eye, and
• wherein the virtual depth guidance element includes one or more virtual indicators each corresponding to a measurable depth of field measurement of the eye within the range of measurable depth of field measurements of the eye;
• and
• a network interface configured to transmit a movement command to a movable device, wherein the movement command corresponds to a second depth of field measurement of the eye determined when the eye is looking at and is focused on one of the one or more virtual indicators on the virtual depth guidance element.