Vision test device

A vision test device comprising:

• a projection unit that projects a test image on a retina of a subject with use of a laser beam by two-dimensionally scanning the laser beam, further including;
• a beam diameter setting unit that sets a beam diameter of the laser beam to a set beam diameter;
• and
• a numerical aperture setting unit that sets a numerical aperture of the laser beam to a set numerical aperture;
• an input unit receiving a response corresponding to visual recognition of the test image from the subject to generate a response input;
• and
• a control unit connected to the input unit, the beam diameter setting unit and the numerical aperture setting unit that measures visual information of the subject based on the response input from the input unit, wherein
• the projection unit projects, on the retina, the test image for measuring the visual information of the subject with use of the laser beam having the set beam diameter and the set numerical aperture, and
• the control unit determines a value for the set numerical aperture for obtaining maximum acquired visual acuity for the subject based on the response input of the subject from the input unit in accordance with a change in the set numerical aperture, and measures the visual information of the subject based on the response input to the input unit in accordance with the visual recognition of the test image projected on the retina with use of the laser beam having the set numerical aperture for obtaining maximum acquired visual acuity for the subject.