Apparatus comprising an accommodating intraocular lens implant, which comprises: an anterior floating lens unit, which comprises an anterior lens; a posterior lens unit, which comprises a posterior lens; an anterior rim complex; levers, which are (a) (i) in jointed connection with the anterior floating lens unit at respective first longitudinal sites along the levers, (ii) in pivotable connection with the anterior rim complex at respective second longitudinal sites along the levers, and (iii) in pivotable contact with the posterior lens unit at respective third longitudinal sites along the levers, and (b) arranged to move the anterior floating lens unit toward and away from the anterior rim complex, in an anterior-posterior direction; and a ring, which has a diameter greater than that of the anterior lens, and which is connected to the levers, wherein the accommodating intraocular lens implant is configured such that the ring deforms during a transition of the accommodating intraocular lens implant between a fully-accommodated state and a fully-unaccommodated state, characterized in that the accommodating intraocular lens implant is arranged such that: elastic potential energy is stored in the accommodating intraocular lens implant as a result of deformation of the accommodating intraocular lens implant during a transition from the fully-accommodated state to the fully-unaccommodated state, and at least 50% of the elastic potential energy stored in the accommodating intraocular lens implant as the result of the deformation is stored in the ring. an anterior floating lens unit, which comprises an anterior lens; a posterior lens unit, which comprises a posterior lens; an anterior rim complex; levers, which are (a) (i) in jointed connection with the anterior floating lens unit at respective first longitudinal sites along the levers, (ii) in pivotable connection with the anterior rim complex at respective second longitudinal sites along the levers, and (iii) in pivotable contact with the posterior lens unit at respective third longitudinal sites along the levers, and (b) arranged to move the anterior floating lens unit toward and away from the anterior rim complex, in an anterior-posterior direction; and a ring, which has a diameter greater than that of the anterior lens, and which is connected to the levers, wherein the accommodating intraocular lens implant is configured such that the ring deforms during a transition of the accommodating intraocular lens implant between a fully-accommodated state and a fully-unaccommodated state, characterized in that the accommodating intraocular lens implant is arranged such that: elastic potential energy is stored in the accommodating intraocular lens implant as a result of deformation of the accommodating intraocular lens implant during a transition from the fully-accommodated state to the fully-unaccommodated state, and at least 50% of the elastic potential energy stored in the accommodating intraocular lens implant as the result of the deformation is stored in the ring. elastic potential energy is stored in the accommodating intraocular lens implant as a result of deformation of the accommodating intraocular lens implant during a transition from the fully-accommodated state to the fully-unaccommodated state, and at least 50% of the elastic potential energy stored in the accommodating intraocular lens implant as the result of the deformation is stored in the ring.