Optical apparatus

An optical apparatus, comprising:

• a photosensitive element;
• a lens, wherein a microstructure unit corresponding to the photosensitive element is formed on the lens;
• an image sensing unit, wherein after plural ambient light beams are transmitted through the lens and received by the image sensing unit, an image is generated, wherein the photosensitive element is included in the image sensing unit;
• and
• a light source providing plural first light beams and plural second light beams, wherein after the plural first light beams pass through the lens, the plural first light beams are transmitted to an object and reflected by the object, wherein the plural second light beams are directly or indirectly transmitted to the photosensitive element without passing through the lens,
• wherein after the plural first light beams reflected by the object pass through the lens, the plural first light beams are received by the microstructure unit and travelling directions of the plural first light beams are changed, so that at least a portion of the plural first light beams is guided to the photosensitive element, and
• wherein a distance of the object from the optical apparatus is acquired according to a time difference between a time point of receiving the plural first light beams by the photosensitive element and a time point of receiving the plural second light beams by the photosensitive element.