Visual optical system for virtual reality head-mounted display

The invention discloses a visual optical system for a virtual reality head-mounted display. The system comprises a three-piece aspheric lens structure, and a lens set meets the conditions that D is larger than or equal to 8 mm, L is larger than or equal to 12 mm and FOV is equal to 80 degrees, wherein D is the exit pupil diameter, L is the exit pupil distance, namely the center distance from a system diaphragm position to a lens L1, and FOV is a system diagonal view field. The focal length of the lens L1 is f1, the focal length of a lens L2 is f2, the focal length of a lens L3 is f3, the totalfocal length of the visual optical system is f, the distance between the lens L3 and the center of the image source is Lz, and the relational expressions as follows are satisfied: 1.6 < f/f1 < 1.75;0.07 < f/f2 < 0.08; 1.3 < |f/f3| < 1.45; 1.5 < f/Lz < 2.0; 5.5 < f/D < 6.0. According to the visual optical system, the imaging quality of the system can be improved, the number of optical elements can be reduced, the weight o