Abstract: An ophthalmic instrument for measuring optical quality of an eye is provided, including: a multi-element eyepiece and a rotatable mirror. A mirror surface of the rotatable mirror is optically conjugated with a first focal plane in an object space of the multi-element eyepiece through a first lens, to adjust an angle of light entering the eye. A focal point of the first lens is arranged in a virtual focal plane of the multi-element eyepiece. The multi-element eyepiece includes an eyepiece, a field lens and a second lens arranged in sequence. The field lens includes a third lens, a fourth lens and a fifth lens arranged in sequence. The eyepiece, the third lens, the fourth lens and the fifth lens each is a positive lens, and the second lens is a negative lens.