The cursor of different intensity moves from the periphery to the center, and the patient changes from not seeing the cursor to seeing it, and the patient reacts when seeing it. Connecting all the reaction points of the boundary between what is unseen and what is seen forms the range of the field of view. The range of visual field varies with the size and brightness of the stimulated cursor. The doctor can see the results of dynamic perimetry at a glance.
The peripheral arc perimeter is generally used as a semi-arc or 1/4 arc metal plate with a radius of 33cm. The examination methods are as basic as the previous dynamic perimetry. Multi-purpose electric projection arc perimeter. Instead of stimulating the cursor, a light tube is attached to the perimeter, through which an oval light spot is illuminated to the inner side of the arc plate. There is an "X" shaped light spot in the center of the arc plate as a fixed target, and the brightness, size and color of the stimulated cursor can be changed at will.
Planar perimeters examine the central part of the visual field, and the most commonly used is Bjerrum's screen. This perimeter is a 1 meter square black screen, on which indistinct stripes follow the tangent of the Angle of view. Draw concentric circles every 5º. During the examination, the patient is seated one meter in front of the perimeter, and the tested eye is focused on the fixed vision target in the center of the perimeter, and the other eye is covered with an eye mask. Use 2mm to stimulate the cursor to move from the center of the perimeter to the periphery or from the periphery to the center, examine at each meridian, and ask the patient where the cursor is seen or not seen, record the boundaries of the dark spots at any time, and finally transcribe all results on the perimeter map.
Goldmann projective hemispherical perimeter is the most representative of many hemispherical perimeter. It integrates a variety of characteristics and can perform dynamic and static field detection, so that you can understand the full picture of the field of vision. From the 1950s to the 1970s, Goldmann perimetry was recognized as the standard perimetry in the West. Goldmann's stimulus cursor size is divided into 0, Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ, corresponding to 1/16mm2, 1/4mm2, 1mm2, 4mm2, 16mm2, 64mm2, and the size of the stimulus cursor is easy to convert. The brightness range of the stimulated cursor is divided into 1, 2, 3, and 4 levels from weak to strong, corresponding to 3.15, 10, 31.5, and 100 millilambert, that is, 31.5, 100, 315, and 1000 ASB (a unit of brightness). Goldmann perimetry as a dynamic perimetry generally uses standard stimulation cursor, they are 0-1, Ⅰ-1, Ⅰ-2, Ⅰ-3, Ⅰ-4, Ⅱ-4, III-4, Ⅳ-4 and Ⅴ-4 in total 9. The basic brightness of the stimulated cursor is 33 times the brightness of the background illumination, and the brightness of the background light changes with the brightness of the stimulated light, and the ratio between the two is 33. The Golemann perimeter can also produce red, green, and blue stimuli by changing the color filter.