(1) The handheld device is shaped like a pen, light and stretched, and has enough room for activities.

(2) the hand is as steady as a rock.

(3) The needle holder, knife and scissors are mastered by the dominant hand, and the tweezers are mastered by the non-dominant hand.

(4) There should be quite satisfactory coordination when both hands operate at the same time.

(5) Any instrument entering the anterior chamber must take a path parallel to the iris surface, and the direction can only be changed after the gyro is in place.

(6) The scene is limited by magnification, and the range of motion of surgical instruments is quite limited. In particular, we should avoid doing less up-and-down exercise.