An accommodating intraocular lens, comprising: an optic portion comprising an optic fluid chamber and an optical axis; and a haptic with a haptic fluid chamber in fluid communication with the optic fluid chamber, the haptic having a proximal end coupled to the optic potion and a closed distal end away from the proximal end, wherein the haptic is adapted to engage a capsular bag and deformable to move the fluid between the haptic fluid chamber and the optic fluid chamber to change an optical parameter of the accommodating intraocular lens, wherein, in a region of the haptic that is adaptd to engage the capsular bag, the haptic has a first cross section (A-A) in a plane that extends in the anterior-to-posterior direction and includes the optical axis in which an outer surface of the haptic has a first configuration, and a second cross section (C-C) in a plane that extends in the anterior-to-posterior direction and includes the optical axis in which an outer surface of the haptic has a second configuration different than the first configuration, wherein the second cross section (C-C) is between the first cross section (A-A) and the proximal end of the haptic, at the second cross section (C-C) the haptic is spaced apart from the optic portion more than at the first cross section (A-A) to provide an access pathway at the second cross section (C-C), characterised in that in the first cross section (A-A) the haptic has a radially inner portion with a first thickness measured in a radial direction relative to the optical axis, and wherein in the second cross section (C-C) the haptic has a radially inner portion with a second thickness measured in a radial direction relative to the optical axis, the second thickness less than the first thickness, and wherein at the first cross section (A-A) the haptic is directly adjacent the periphery of the optic portion,. an optic portion comprising an optic fluid chamber and an optical axis; and a haptic with a haptic fluid chamber in fluid communication with the optic fluid chamber, the haptic having a proximal end coupled to the optic potion and a closed distal end away from the proximal end, wherein the haptic is adapted to engage a capsular bag and deformable to move the fluid between the haptic fluid chamber and the optic fluid chamber to change an optical parameter of the accommodating intraocular lens, wherein, in a region of the haptic that is adaptd to engage the capsular bag, the haptic has a first cross section (A-A) in a plane that extends in the anterior-to-posterior direction and includes the optical axis in which an outer surface of the haptic has a first configuration, and a second cross section (C-C) in a plane that extends in the anterior-to-posterior direction and includes the optical axis in which an outer surface of the haptic has a second configuration different than the first configuration, wherein the second cross section (C-C) is between the first cross section (A-A) and the proximal end of the haptic, at the second cross section (C-C) the haptic is spaced apart from the optic portion more than at the first cross section (A-A) to provide an access pathway at the second cross section (C-C), characterised in that in the first cross section (A-A) the haptic has a radially inner portion with a first thickness measured in a radial direction relative to the optical axis, and wherein in the second cross section (C-C) the haptic has a radially inner portion with a second thickness measured in a radial direction relative to the optical axis, the second thickness less than the first thickness, and wherein at the first cross section (A-A) the haptic is directly adjacent the periphery of the optic portion,.