References(8) Within the visual field, the visual obstruction usually takes place in case which a transmissive screen exists between the eyes and the visual objects. When the inhomogeneous screen, such as mesh and Venetian blind, is used as the materials for the screen, the phenomenon cutting off the objects partially or the one producing a veiling of light is sometimes observed. In the case, these phenomena are complicatedly observed in both experiment and theory in comparison with the phenomenon observed by the homogenious screen. A Randolt ring and screen material were set up in an experimental room, and the visual acuity of a human subject was measured with regard to the lighting conditions, the organization of the composition of the screen, the movement of the visual objects and the relative positions of the eyes, and the screen and the object. These above-mentioned experiments had the result of confirming the existence of glare effects caused by the inhomogenious screens.
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