A subjective refraction apparatus provides a variable optical correction along an optical axis. The subjective refraction apparatus comprises a pair of lenses (70, 80 50, 60) mounted on a mount (20 30) in such a manner that the lenses (70, 80 50, 60) are movable with respect to each other in a direction perpendicular to the optical axis for generating a variable spherical power along the optical axis.The mount (20 30) is provided with a support (24 34) defining a space for removably receiving an additional lens on the optical axis.
