Abstract: A computer controlled perimetry system, which is easily operated even by an unskilled operator, for accurately measuring a visual field, and with which many patients can be effectively examined, has a dome having a hemispherical inner surface; a projector projecting a light spot onto the inner surface of the dome; an arm for horizontally moving the projector so as to trace a semicircle along the surface of a virtual hemisphere opposite to the dome; a first motor for driving the arm; a second motor for changing the projecting direction of the projector; a liquid crystal display for displaying the light spot projected onto the inner surface of the dome; a monitor display for observing a patient; and a computer storing a program for controlling the rotation of the first and second motors. Thus, the light spot projected by the projector can be swept to any point on the inner surface of the dome.

Abstract: A computer controlled perimetry system, which is easily operated even by an unskilled operator, for accurately measuring a visual field, and with which many patients can be effectively examined, has a dome having a hemispherical inner surface; a projector projecting a light spot onto the inner surface of the dome; an arm for horizontally moving the projector so as to trace a semicircle along the surface of a virtual hemisphere opposite to the dome; a first motor for driving the arm; a second motor for changing the projecting direction of the projector; a liquid crystal display for displaying the light spot projected onto the inner surface of the dome; a monitor display for observing a patient; and a computer storing a program for controlling the rotation of the first and second motors. Thus, the light spot projected by the projector can be swept to any point on the inner surface of the dome.

Abstract: Test charts for metamorphopsia comprises a plurality of dotted lines of predetermined lengths, preferably of the same length. The dotted lines consist of a dotted line (a) having a smallest constant inter-dot interval, a dotted line (b) (see FIG. 10) having a largest constant inter-dot interval, and remaining dotted lines (cn) (see FIGS. 2-10) having constant inter-dot intervals, respectively, which fall within an intermediate interval range between the smallest constant inter-dot interval and the largest constant inter-dot interval.

Abstract: An instrument for removing proliferative membranes in a treatment for proliferative vitreoretinal disorders includes an ophthalmic treatment tool for using in an ophthalmic surgery, the tool including: a grip portion; a rod-shaped body attached to one end of the grip portion; an elastic body fitted along a direction toward a front end of the rod-shaped body to the front end side of the rod-shaped body; and hard inorganic fine-grains or particles fixed on a tapered tip of the elastic body.