Depicting the sidelong glance presents few technical problems for the artist. These illustrations demonstrate, though, that more changes in the eye than simply the iris moving to the side. The shape of the eye itself alters depending on the iris position. The rule is that the high point of the arch of the upper lid is always above the iris (it's lifted by the cornea). The lower lid, however, changes very little as the iris shifts. The net effect of the modifications is that the eye alters in shape from oval to almond as the iris turns. The iris itself appears less circular as it turns. In the most extreme position (A) the iris shape is blunt at one end and much narrower than it is high.
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