Optical device and optometric equipment comprising such an optical device

An optical device comprising:

• a lens and a control member configured such that motion of the control member produces a change in an optical power provided along an optical axis of the lens;
• a motor;
• a driving member;
• and
• a framework including a frame defining a cavity having a first cylindrical portion having a first diameter, a second cylindrical portion having a second diameter smaller than the first diameter, and a third cylindrical portion having a third diameter smaller than the second diameter,
• wherein said motor includes an output shaft rotatively coupled to said driving member, the motor and the control member being mounted in the framework such that the driving member and the control member mechanically cooperate, and
• wherein the driving member includes a first axial portion, a second axial portion and a threaded portion separating the first axial portion and the second axial portion,
• wherein the first axial portion of the driving member is press fit into an inner race of a rolling bearing such that the driving member is rotatably mounted in the framework,
• wherein biasing means are held between an outer race of the rolling bearing and a ring shaped wall connecting the first cylindrical portion and the second cylindrical portion, and
• wherein a further rolling bearing is mounted on the second axial portion of the driving member and is accommodated in the cavity at a level of the third cylindrical portion.