Kinetic visual field with changing contrast and brightness

Dynamic perimetry is the area in which a subject is able to recognize a moving target by eye. It is used in medical tests to diagnose glaucoma and cataracts. Evaluation of the kinetic visual field involves the use of an isopter. In a previous study, the area of the kinetic visual field was shown to become smaller with decreased target brightness and advancing age (Hashimoto, 2003). Moreover, the fields in the left and right eyes are the same. It is also known that dementia patients experience symptoms that lower their ability to recognize objects under conditions of weak contrast between the target object and the background (Trick, Trick, Morris, & Wolf, 1995). However, the exact relationship between this contrast and their visual fields is unknown. In this study, the areas of kinetic visual field were measured quantitatively on normal people as a fundamental study of the early detection of dementia in patients. These results were reported using an improved Goldmann perimeter, which has an electric slider to operate targets at constant speeds.