Switchable spectacles

An optical lens assembly to be worn externally by a wearer, the optical lens assembly comprising:

• at least one switchable lens configured to switch its foci from a first focal length to a second focal length, where the second focal length is different from the first focal length;
• an infrared emitter disposed at one periphery of the at least one switchable lens and/or a frame capturing the at least one switchable lens, the infrared emitter configured to emit an infrared radiation;
• an infrared sensor disposed at an opposite periphery of the at least one switchable lens and/or frame, the infrared sensor configured to detect the infrared radiation from the infrared emitter;
• wherein the at least one switchable lens is configured to switch to its first focal length when the infrared sensor detects a first intensity of the infrared radiation and is configured to switch to its second focal length when the infrared sensor detects a different intensity of the infrared radiation.

A pair of spectacles having a frame, the pair of spectacles comprising:

• at least one switchable lens attached to the pair of spectacles, the at least one switchable lens configured to switch its foci from a far focal length to a near focal length, where the near focal length is smaller the far focal length;
• an infrared emitter disposed at one side periphery of the at least one switchable lens and/or frame, the infrared emitter configured to emit an infrared radiation;
• an infrared sensor disposed at an opposite side periphery of the at least one switchable lens and/or frame, the infrared sensor configured to detect the infrared radiation from the infrared emitter;
• wherein the at least one switchable lens is configured to switch to its far focal length when the infrared sensor detects the intensity of infrared radiation that has been emitted and reflected off a front surface of a wearer's eye ball when the wearer is looking forward;
• and
• wherein the at least one switchable lens is configured to switch to its near focal length when the infrared sensor detects a reduced intensity or zero intensity of infrared radiation when the infrared radiation is partly or fully blocked from reflecting off the front surface of the wearer's eye ball by an upper eyelid of the wearer when the wearer is looking downward.