Pupil measuring pen

The utility model discloses a pupil measuring pen, which comprises a pen holder, wherein a lighting lamp is arranged on the end portion of the pen holder, a distance measuring lamp is arranged on one side of the lighting lamp, the colors of light rays which are sent from the distance measuring lamp and the lighting lamp are different, a shading plate is arranged on the front end of the distance measuring lamp, a pair of light holes are arranged on the shading plate, and the shading plate can move along the direction close to or far away from the lamp measuring lamp. The pupil measuring pen supplies a measure ruler according to an optical principle, and can objectively and truly measure the size of pupils of patients. Compared with an existing subjective cognizance method, the pupil measuring pen enables measured data to have more reference value, can be used for optometry and traces changes of the pupils of the patients at the same time, can seize dynamic conditions of the size of the pupils by simply operating and adjusting, and supplies an excellent auxiliary tool for change research of the pupils. The pupil measuring pen is simple in structure, practical in function and convenient to use.