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Facial anatomy

The eyes lie at the junction of the upper and middle third of the face. The distance between the eyes is roughly equivalent to the width of one eye (actually slightly wider) or the root of the nose (actually slightly narrower). The curves of the upper and lower eyelids are different, the margin of the upper lid lies along the circumference of a smaller circle (2/3 of the radius of the lower lid). The highest point of the upper eyelid lies one third of the way from the medial canthus, whilst the lowest point of the lower lid lies one third of the way from the lateral canthus – at the medial and lateral corneal limbi approximately.