Lens introduction device 10 inside the eye becomes, having the tubular housing 15 which has the plunger 32 which distribution facilities is done for longitudinal direction inside the particular tubular housing. As as for electric drive system 38, point 25 of the above-mentioned plunger engages in insertion cartridge, 20 folds up the lens inside the eye which distribution facilities is done inside and discharges, in order to introduce the lens which was folded up to inside the lens pouch of the eyeball, the above-mentioned plunger is made to move to longitudinal direction parallel. In order that the control circuit 100 makes the parallel displacement of the above-mentioned plunger start according to user input, detects one obstacle state at least on the basis of the back electromotive force which is formed by electric motor 42 at the same time, makes the parallel displacement of the above-mentioned plunger stop according to an obstacle state where it is detected, it is constituted, the above-mentioned obstacle state, the excessive resistance for the front parallel displacement or rear parallel displacement of the above-mentioned plunger, or, can consist of the insufficient resistance for the front parallel displacement of the above-mentioned plunger.眼内レンズ導入デバイス10は、当該筒状ハウジング内に長手方向に配設されたプランジャ32を備える筒状ハウジング15を備えて成る。電気駆動システム38は、上記プランジャの先端部25が挿入カートリッジ20に係合し、内部に配設された眼内レンズを折畳んで排出すると共に、折畳まれたレンズを眼球の水晶体嚢内へと導入する様に、上記プランジャを長手方向に平行移動させる。制御回路100は、ユーザ入力に応じて上記プランジャの平行移動を開始させ、電気モータ42により生成された逆起電力に基づいて少なくとも1つの障害状態を検出し、且つ、検出された障害状態に応じて上記プランジャの平行移動を停止させるべく構成され、上記障害状態は、上記プランジャの前方平行移動若しくは後方平行移動に対する過剰抵抗、又は、上記プランジャの前方平行移動に対する不十分な抵抗から成り得る。
