Disclosed are a subjective optometry instrument and an optometry method. The subjective optometry instrument comprises an imaging lens (103) and a marker (101), the front surface of the cornea of a subject eyes (104) is located at the focal point of the imaging lens (103), the marker (101) and subject eyes (104) are respectively located on the two sides of the imaging lens (103) along the optical axis of the imaging lens (103), the marker (101) is set to move forwards and backwards along the optical axis of the imaging lens (103), the subjective optometry instrument is labeled, along the movement path of the marker (101), with a value D1 for identifying spherical power, a movement position x is obtained by subtracting a focal distance f0 from the object distance of the marker (101), and when the subject eyes (104) have a clear sight of the marker (101), the spherical power of glasses for the subject eyes (104) is the spherical power D1 corresponding to the movement position x where the marker is located. Other than the traditional scheme where positional change of the eyepiece lens and human eyes are needed to realize different refractive compensations, movement of the human eyes and the lens is not required in the optometry instrument and the optometry method, and instead, only the marker needs to be moved, therefore, both simplicity and convenience and low cost are achieved.Linvention concerne un instrument doptométrie subjective et un procédé doptométrie. Linstrument doptométrie subjective comprend une lentille dimagerie (103) et un marqueur (101). La surface avant de la cornée des yeux dun sujet (104) est située au point focal de la lentille dimagerie (103), le marqueur (101) et les yeux du sujet (104) sont respectivement situés sur les deux côtés de la lentille dimagerie (103) le long de laxe optique de la lentille dimagerie (103). Le marqueur est réglé pour se déplacer davant en arrière le long de laxe optique de la lentille dimagerie (103). Linstrument doptom
