ABSTRACT This study shows how changes of target size and changes of illuminance affect the dimension of the peripheral visual field. The conventional method of testing (kinetic) was done on the tangent screen. Forty‐nine subjects were tested. Each subject went from a dark adapted state to varying levels of light adaptation. The size of the visible field for one meridian was measured using five different target sizes and five different levels of brightness.
Kahwaji et al. (Mon,) studied this question.