Abstract: In this invention, a control unit in an ophthalmic image processing device acquires an ophthalmic image captured by an ophthalmic image capture device (S11). The control unit, by inputting the ophthalmic image into a mathematical model that has been trained by a machine-learning algorithm, acquires a probability distribution in which the random variables are the coordinates at which a specific site and/or a specific boundary of a tissue is present within a region of the ophthalmic image (S14). On the basis of the acquired probability distribution, the control unit detects the specific boundary and/or the specific site (S16, S24).

Abstract: A stopper mechanism includes a second cylinder disposed at an end in a first cylinder, a second piston disposed so as to be able to move according to a movement of a piston rod to be fitted into the second cylinder, and an annular piston ring having ends in a circumferential direction by being partially cut off. A circumferential groove is formed on an outer circumferential of the second piston. The circumferential groove includes a bottom surface, a one-side end surface, and an opposite-side end surface. The piston ring is axially movably disposed in the circumferential groove. The piston ring includes axial abutment portions, and radial abutment portions at the both ends of the piston ring. When the piston ring abuts against the one-side end surface of the circumferential groove, a first passage is forced between the one-side end surface and an end surface of the piston ring.

Abstract: A stopper mechanism includes a second cylinder disposed at an end in a first cylinder, a second piston disposed so as to be able to move according to a movement of a piston rod to be fitted into the second cylinder, and an annular piston ring having ends in a circumferential direction by being partially cut off. A circumferential groove is formed on an outer circumferential of the second piston. The circumferential groove includes a bottom surface, a one-side end surface, and an opposite-side end surface. The piston ring is axially movably disposed in the circumferential groove. The piston ring includes axial abutment portions, and radial abutment portions at the both ends of the piston ring. When the piston ring abuts against the one-side end surface of the circumferential groove, a first passage is forced between the one-side end surface and an end surface of the piston ring.