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 . <EOS>