Precise pupil measuring instrument

A precise pupil measuring instrument relates to the technical field of medical auxiliary appliances and comprises a charge coupled device (CCD) camera and a shell, the shell is of a gun-shaped structure, the position of a handle of the shell is a battery cabin used for installing a battery, the CCD camera is arranged at the gun head end of the shell, and a microprocessor and a storage unit are arranged in the shell. A display screen is arranged at the end, away from the CCD camera, of the shell, and a control switch used for controlling the CCD camera is arranged on the inner side of the corner position of the shell. A guide rod is arranged on the side, corresponding to the CCD camera, of the shell, an arc-shaped positioning block is arranged at the end, away from the shell, of the guide rod, an arc-shaped illuminating lamp strip is embedded in the inner arc face of the arc-shaped positioning block, and a cross coordinate used for reference is arranged on the side, corresponding to the guide rod, of the arc-s