She was staring at him when his visual exploration was over.
Here you find articles in the encylopedia on topics related to the visual arts.
The simplest type of ocellus is exemplified by the exumbral ocellus of Aurelia, a simple patch of pigment-cells interspersed with visual cells, the whole on a level with the remaining ectodermal epithelium.
The eye-pieces or oculars through which, in case of visual observations, the primary images formed by the objective are viewed, are of quite secondary importance as regards definition in the central portion of the field of view.
To the interposition of air is due the fact that all visual images are to some extent blurred.