The invention provides a large view
field angle eyepiece optical
system for a head-mounted displayer, wherein the large view
field angle eyepiece optical
system comprises a first lens, a second lens, and a third lens which are successively and coaxially arranged along an
optical axis direction from a
human eye observing side to a displayer side; the first lens and the third lens are all positive lenses and the second lens is a negative lens; the surface, facing the
human eye observing side, of the first lens is projected towards the
human eye observing side and has a positive curvature
radius; the surface, facing a diaphragm side, of the second lens is projected away from the human eye observing side and has a negative curvature
radius; and at the same time, the materials, the focuses and the positions of the first lens, the second lens and the third lens should satisfy certain relationship, so that an image displayed on the displayer is imaged in human eyes after the image is amplified by an
eyepiece. The eyepiece has the advantages of large hole
diameter, large view field,
high resolution ratio,
low distortion and small size; and the eyepiece is suitable for head-mounted displayers and apparatuses similar to the head-mounted displayers.