Optometry apparatus capable of measuring para-central defocus

An optometry apparatus capable of measuring para-central defocus, comprising a first light source emitting a first light beam, wherein, the optometry apparatus further comprises a diaphragm, a first lens group, a beam splitter, a third lens group, a fourth lens group, a first photoelectric detector, a fixation vision module enabling an eyeball of a subject in a relaxed state, and a scanning module for changing a position of a light spot formed on the retina by the first light beam;

• wherein, the first light source, the diaphragm, the first lens group, the beam splitter, the third lens group, the fourth lens group and the first photoelectric detector form a diopter measurement module;
• the fixation vision module comprises a second dichroic mirror totally transmitting visible light and totally reflecting the first light beam;
• the scanning module comprises a first reflecting mirror and a second reflecting mirror which are rotatably positioned in sequence in an emergent optical path of the first light source, the rotation axis of the first reflecting mirror and the rotation axis of the second reflecting mirror form therebetween an angle greater than 0 degree and less than 180 degrees;
• the diaphragm, the first reflecting mirror, the first lens group, the second reflecting mirror, the beam splitter and the second dichroic mirror are disposed in the emergent light path of the first light source successively, the third lens group, the fourth lens group and the first photoelectric detector are disposed in a reflected light path of the beam splitter successively.