Otoscope

An otoscope, comprising a sensing part, wherein the sensing part comprises:

• a case;
• a plurality of light sources;
• and
• an optical sensing device, disposed in the case, and along an optical axis from an object side to an image side sequentially comprising:
• a first lens element, having a positive refracting power;
• a second lens element, having a refracting power;
• a third lens element, having a positive refracting power;
• a fourth lens element, having a refracting power;
• and
• a fifth lens element, having a positive refracting power,
• wherein the otoscope has a total of five lens elements having refracting power, and the plurality of light sources are configured to emit infrared light toward the object side,
• wherein the plurality of light sources have a partial maximum luminous intensity within a wavelength range of 900 nm to 1700 nm.