From Goldberg RA, Wu JC, Jesmanowicz A, et al. Eyelid anatomy revisited. Dynamic high-resolution magnetic resonance images of Whitnall’s ligament and upper eyelid structures with the use of a surface coil. Arch Ophthalmol 1992;110:1598–600, with permission.

The vertical proportions of the midface should be well appreciated. The area between the eyebrows and the upper eyelid margin can be divided into thirds. The distance between the eyebrows and the upper eyelid crease occupies two thirds, while that between the upper eyelid crease and the upper eyelid margin is one third. The eyebrow fat pad is usually located above the superior orbital rim. Hereditary factors and involutional changes can cause a descent of this eyebrow fat pad, which thus encroaches on the upper eyelid space and gives a ‘full’ appearance. A beginning surgeon might erroneously attribute this fullness to preaponeurotic fat prolapse and formulate an inaccurate operative plan.

The upper eyelid crease is formed by the farthest superior attachments of the levator aponeurosis to the skin. The actual crease is not typically visible in occidental eyelids because a variable flap of skin, the eyelid fold, hangs down over the crease. The exact positions, extents, and definitions of both the crease and the fold, as well as any subtle asymmetries, should be noted preoperatively and incorporated into the operative plan.

The contour of the tightly attached skin over the levator aponeurosis and tarsus forms the eyelid ‘platform,’ which we call the ‘tarsal platform show’. The septal fat pannus overlies the levator and upper tarsal plate. Racial variations exist, and are important here. At one extreme lies the Asian patient, with an abundant septal fat pannus consisting of skin, subcutaneous eyelid and eyebrow fat that covers the entire tarsal plate, and essentially obliterates any visible platform. At the other extreme lies the aged Caucasian patient with superior sulcus fat atrophy, in which case the entire levator can often be followed up into the orbit, sometimes even with Whitnall’s ligament exposed as a horizontal band just below the orbital rim (Fig. 51.2A and B).

Fig. 51.2 (A) Typical upper eyelid appearance and contour of Asian patient demonstrating full upper eyelid and lack of noticeable crease. (B) Typical upper eyelid appearance and contour of elderly Caucasian patient demonstrating superior sulcus atrophy and visible underlying structures.

The most medial portion of the upper eyelid, combined with the lateral surface of the nose and the medial canthus, constitutes an area that deserves particular attention. Redundancy in this area is often related to eyebrow ptosis, with tissues encroaching from the glabella to form a diamond-shaped deformity. We can see these changes in a composite photograph of a woman at age 25 and age 75 (Fig. 51.3). This anatomically complex area has different tissue characteristics from the interdigitation of different skin textures. Incisions should not extend into this area because of the high potential of producing postoperative webs or other irregularities that give an esthetically unpleasant outcome (Fig. 51.4). Elevation of the redundant eyebrow tissues out of the multicontoured space, for example through endoscopic forehead lift, is often more effective in restoring the normal width of the radix and improving the contours in the multicontoured medial eyelid space.

Fig. 51.3 Eyelid changes with aging include loss of superior orbital and eyebrow fat, lower orbital fat prolapse, and most significantly skin changes (laxity and deflation of subcutaneous and suborbicularis fat pads).

Fig. 51.4 Medial web following upper blepharoplasty; this can occur if the incision extends medially, and wound contraction pulls the inelastic skin tight across the medial multicontoured region.

The lower eyelid is composed of skin and underlying orbicularis muscle, which continues past the lower orbital rim onto the face. Behind the orbicularis, near the lid margin, is the tarsal plate. The orbital septum fuses with the inferior border of the tarsus and continues caudally to attach to the crest of the lower orbital rim at the arcus marginalis. Just behind the orbital septum are the lower eyelid orbital fat compartments. The orbital fat is bordered posteriorly and superiorly by the lower eyelid retractors, which arise from the inferior rectus muscle and tendon. The lower lid retractors fuse with the orbital septum approximately 5 mm inferior to the inferior tarsal border before inserting onto the tarsal plate. Posteriorly, the lower eyelid retractors are closely adherent to the palpebral conjunctiva of the lower lid (Fig. 51.5).The orbital fat is surrounded by many fine connective tissue septae (septae of Koorneef). A fascial extension of the sheath of the inferior oblique muscle and Lockwood’s ligament called the arcuate expansion inserts on the inferolateral orbital rim and separates the central from the lateral fat compartments. The inferior oblique muscle originates from the anterior medial orbital floor and separates the medial fat compartment from the central fat compartment as it passes posteriorly and laterally beneath the equator of the globe. The lateral fat compartment lies more posteriorly, the central fat compartment lies more anteriorly, and the medial fat compartment is paler in color. As shown in Figure 51.5, the orbital fat can be easily accessed by incising the conjunctiva and lower lid retractors in the fornix while the orbital septum remains well anterior to these structures.

Fig. 51.5 Sagittal section of the lower eyelid demonstrating the relationship of the conjunctiva, lower eyelid retractors, and orbital septum to the orbital fat.

Modified from Baylis HI, Long JA, Groth MJ: Transconjunctival lower eyelid blepharoplasty: Technique and complications. Ophthalmoloy 1989;96:1027–32.

Eyelid assessment: fundamental principles and surgical planning

Upper blepharoplasty

Because blepharoplasty surgery is concerned with anatomy, understanding the surface anatomy of the eyelid complex and its deep underpinnings leads to an accurate assessment of the individual patient, as well as to a sound surgical plan. The best way to learn what blepharoplasty accomplishes is by examining preoperative and postoperative photographs of blepharoplasty patients. This discipline of photograph review should extend to the individual surgeon’s own patients, so that one can learn from one’s own experience.

Aging changes are important. Although some young patients come in for blepharoplasty because of congenital characteristics that displease them, most patients seek blepharoplasty surgery because of age-related changes in the eyelid complex, which are characterized by skin texture changes (with loss of elasticity and formation of wrinkles), enophthalmos (with loss of fat), and inferior displacement of fat (with lower eyelid fat prolapse). It is important to avoid excessive fat removal from the upper eyelid, and attention to eyebrow position is critical for successful rejuvenation of the aging eyelid complex.

Upper eyelid fullness is generally a congenital condition (Fig. 51.6A). It can be addressed by removal of fat from the upper eyelid, exposing the underlying levator aponeurosis and tarsus (Fig. 51.6B, presurgery and C, postsurgery). The surgeon must recognize when the fullness in the eyelid complex is caused by eyebrow descent. The eyebrows are held at a certain position by the tone of the frontalis muscle, which maintains comfortable vision. If heavy tissues are removed from below the brow, it will descend to its resting position (Figs 51.7 and 51.8).

Fig. 51.6 (A) Upper eyelid fullness is generally a congenital condition as demonstrated in photographs of this patient at a young age. (B) In middle life. (C) The same patient with good structure and good eyebrow position demonstrating effective conservative removal of redundant tissue to display the underlying structure of the septal fat pannus in the upper eyelid to reveal the underlying platform of tightly apposed skin, levator, and tarsal plate.

Fig. 51.7 Eyebrows maintained in comfortable position for vision by frontalis tone.

Fig. 51.8 Eyebrow descent cause by release of frontalis tone following blepharoplasty.

If too much of the septal fat pannus and ROOF (retro-orbicularis oculi fat or eyebrow fat pad) is removed, the underlying structures will be exposed to an undesirable degree (Fig. 51.9A and B). As already mentioned, excessive hollowness of the superior sulcus gives an aged appearance to the eyelid complex. Blepharoplasty in the thin aged upper eyelid must be conservative, with minimal removal of fat. Because there will not be much of a septal fat pannus or eyelid fold to cover the incision, the crease is often made high in the eyelid where it will fall into the shadow of the superior sulcus and be relatively hidden.

Fig. 51.9 (A) Removal of too much of the orbital fat and associated soft tissue reveals the deep structures of the levator and orbital rim (B) (including the inverted ‘V’ of the superior orbital notch and valley of the superior oblique tendon).

If the globe is relatively prominent, the tarsal platform show will be more readily exposed by removing orbital fat (Fig. 51.10). The orbital fat and full eyelid tissues actually benefit the patient by masking underlying proptosis. In this situation the admonition ‘big eye, big trouble’ should be heeded, and fat removal should be conservative or even avoided altogether, perhaps in favor of orbital decompression for proptosis reduction.