of or pertaining to the science of vision; optical.-pertaining to the art, or in accordance with the laws, of perspective.-a glass through which objects are viewed.-that which is seen through an opening; a view; a vista.-the effect of distance upon the appearance of objects, by means of which the eye recognized them as being at a more or less measurable distance. hence, aerial perspective, the assumed greater vagueness or uncertainty of outline in distant objects.-the art and the science of so delineating objects that they shall seem to grow smaller as they recede from the eye; -- called also linear perspective.-a drawing in linear perspective.