Image projection device, vision test device, and fundus photography device

A vision test device comprising:

• a light source;
• a scanning unit that scans a light beam emitted from the light source;
• an optical system that converges a plurality of light beams, which are emitted from the scanning unit at different times, at a convergence point in an eye of a subject and then irradiates the retina of the subject with the plurality of light beams;
• and
• an input unit to which a response of the subject to the plurality of light beams applied to the retina is input,
• wherein diameters of the plurality of light beams are adjusted to 0.36 mm or greater and 0.46 mm or less when a half angle of a larger one of a horizontal angle of view and a vertical angle of view of an area where the retina is irradiated with the plurality of light beams at the convergence point is 10° or greater and 30° or less.

A fundus photography device comprising:

• a light source;
• a scanning unit that scans a light beam emitted from the light source;
• an optical system that converges a plurality of light beams, which are emitted from the scanning unit at different times, at a convergence point in an eye of a subject and then irradiates a retina of the subject with the plurality of light beams;
• a detector that detects the plurality of light beams reflected by the retina;
• and
• an acquisition unit that acquires a fundus image of the subject from the plurality of light beams detected by the detector,
• wherein, when a half angle of a larger one of a horizontal angle of view and a vertical angle of view of an area where the retina is irradiated with the plurality of light beams at the convergence point is 10° or greater and 30° or less, diameters of the plurality of light beams incident on the cornea of the subject are adjusted to 0.36 mm or greater and 0.46 mm or less.