An implantable ophthalmic device with one or more optical elements coupled to one or more shape-memory members provides dynamically variable optical power to restore lost accommodation in individuals suffering from presbyopia or aphakia. Running current from a power supply through the shape-memory members causes the shape-memory members to heat up. Once the current heats the shape-memory members past a forward phase-transition temperature, the shape-memory members change shape, which, in turn, causes the optical element(s) to move, yielding a corresponding change in effective optical power. Cooling the shape-memory members (e.g., by reducing or stopping the flow of current) below a reverse phase-transition temperature causes the shape-memory members to return to their original shape, which, in turn, restoring the optical element(s) to their original positions and returning the effective optical power to its original level.一以上の光学素子が一以上の形状記憶部材に結合された埋込可能眼科装置が、老眼又は無水晶体症を患う個人の遠近調節欠如を回復させる動的可変屈折力を与える。電源からの電流が形状記憶部材を通って流れると当該形状記憶部材の加熱が引き起こされる。ひとたび電流が形状記憶部材を加熱して順相転移温度を通過すると、当該形状記憶部材は形状が変化し、次に単数又は複数の光学素子が動き、対応する有効屈折力変化が得られる。形状記憶部材を(例えば電流の流れを低減又は停止させることによって)逆相転移温度未満に冷却すると、当該形状記憶部材は元の形状に戻り、次に単数又は複数の光学素子が元の位置まで回復し、有効屈折力がその元のレベルまで戻る。
