Periocular Balance & Apparent Eyelid Hooding
[Asymmetry Series: Part 2C]

By Jude Harford

BNurs (Hons), PgDip (Adv Practice), NMIP

Nurse Practitioner, skinByJude

Jude is a prescribing aesthetics nurse practitioner with a strong interest in menopausal skin health and regenerative treatments. Her focus is on achieving natural results through evidence-based practice using the highest quality product

• Website: https://skinbyjude.co.uk/
• Instagram: https://www.instagram.com/skin_by_jude/

Concluding our upper facial analysis following Part 1: Treating Facial Muscle Asymmetry with Botulinum Toxin, this article focuses on eyelid position, vector movement, and key diagnostic pitfalls.

See also Upper Facial Muscle Balance: Frontalis & Brow Depressors [Asymmetry Series: Part 2A] and Managing Frontalis & Brow Depressor Asymmetry [Asymmetry Series: Part 2B].

Eyelid Position and Apparent Hooding

Upper eyelid hooding is one of the commonest concerns encountered in aesthetic practice, yet it is also one of the most frequently misunderstood.

Patients often describe one eye as “smaller” or “heavier”, assuming that the problem lies within the eyelid itself. However, eyelid appearance reflects the interaction of multiple anatomical structures, including skin, orbital fat, brow position, frontalis activity and levator function. The visible asymmetry may therefore arise from structural changes, muscular compensation or a combination of both.

A careful assessment is essential before concluding that botulinum toxin has a role.

Structural versus Functional Hooding

Perhaps the most useful distinction is between structural and functional causes.

Structural causes include:

• dermatochalasis
• brow ptosis
• age-related descent of soft tissues
• congenital anatomical variation
• previous surgery
• skeletal asymmetry

These are unlikely to improve with neuromodulation alone.

Functional causes relate to differences in muscle activity.

Examples include:

• asymmetrical frontalis recruitment
• excessive brow depressor activity
• compensatory eyebrow elevation
• previous botulinum toxin treatment
• facial nerve dysfunction

In these patients, altering muscle balance may improve the appearance of asymmetry, provided the underlying mechanism has been correctly identified.

Compensatory Frontalis Activity

Patients with unilateral hooding frequently recruit the ipsilateral frontalis to elevate the brow and improve the superior visual field.

The consequence is an eyebrow that sits higher than the contralateral side despite the eyelid still appearing heavier.

This creates an important clinical trap.

The elevated eyebrow may appear to be the abnormality when, in reality, it represents the patient’s attempt to compensate for underlying eyelid or brow heaviness.

Reducing frontalis activity without recognising this adaptation may worsen the patient’s symptoms and increase functional brow ptosis.

Clinical Assessment

Assessment should include:

• brow height
• upper lid show
• margin reflex distance where appropriate
• levator function
• frontalis recruitment at rest
• frontalis recruitment during conversation
• degree of dermatochalasis
• visual field symptoms

Patients should also be asked whether they consciously raise one eyebrow during reading, driving or prolonged screen use, as this often indicates compensatory recruitment.

Treatment Philosophy

Treatment should address the underlying cause rather than the visible consequence.

In some patients, reducing excessive activity within the brow depressor complex may permit greater brow elevation without significantly weakening frontalis support.

Conversely, where structural hooding predominates, referral for surgical assessment or acceptance of anatomical limitations may represent the most appropriate management.

Combining Muscles: Treating Movement Rather Than Individual Muscles

Perhaps the greatest transition in aesthetic practice occurs when practitioners move beyond thinking in terms of individual muscles and begin considering patterns of movement.

Patients rarely present complaining of an overactive corrugator or asymmetric frontalis. They present because one eyebrow sits lower, one eye appears smaller or their smile looks uneven.

These visible findings are the end result of complex interactions between multiple muscles.

Consequently, successful treatment requires practitioners to think functionally rather than anatomically.

Every facial movement represents the balance between:

• agonists
• antagonists
• synergists
• compensatory recruitment

Weakening one muscle inevitably alters the behaviour of neighbouring muscles.

For example, a patient with unilateral brow elevation may demonstrate:

• greater frontalis activity
• weaker ipsilateral brow depressors
• stronger contralateral corrugator activity
• compensatory eyebrow elevation secondary to dermatochalasis

Although the visible asymmetry appears identical, the underlying mechanisms differ considerably.

Treatment planning should therefore begin with movement analysis rather than muscle selection.

One useful approach is to ask:

• Which movement concerns the patient?
• Which muscles normally produce that movement?
• Which opposing muscles should relax?
• Which muscles appear disproportionately active?
• Is the apparent overactivity primary or compensatory?

Only after answering these questions should treatment be considered.

This approach greatly reduces the risk of treating the wrong muscle and creating secondary asymmetry.

Clinical Assessment Pearls

Observe before examining

Some of the most useful information is gathered before formal assessment begins. Watch the patient walking into the consultation room, introducing themselves, laughing and engaging in conversation. Dynamic asymmetries frequently disappear once patients become aware they are being observed.

Examine movement slowly

Rapid facial expressions may conceal subtle asymmetry. Ask patients to perform each movement slowly and independently before observing spontaneous expression.

Compare movement, not wrinkles

Wrinkle depth reflects skin quality as much as muscle activity. Always assess muscle contraction directly rather than assuming the deepest wrinkle represents the strongest muscle.

Consider compensation first

An apparently overactive muscle is often compensating for weakness elsewhere. Before deciding to reduce activity, ask why the muscle is working harder.

Think in vectors

Every facial muscle pulls in a particular direction. Visualising these force vectors frequently makes the underlying cause of asymmetry much easier to understand than simply naming muscles.

Use video routinely

Short videos often reveal subtle asymmetries that are missed on still photography. Video also provides an invaluable baseline for review appointments.

Review with the original assessment

Patients often forget their pre-treatment movement patterns. Reviewing photographs and videos alongside the original examination allows a far more objective assessment of treatment success.

Common Pitfalls

Treating wrinkles instead of movement

Wrinkles are a consequence of movement, not the diagnosis itself. Treatment should always be directed by muscle function rather than wrinkle severity.

Assuming the higher eyebrow is abnormal

The elevated brow frequently represents compensation for ipsilateral eyelid hooding or stronger contralateral brow depressors. Lowering the elevated brow without understanding the underlying mechanism may worsen facial balance.

Ignoring structural anatomy

Botulinum toxin cannot correct dermatochalasis, skeletal asymmetry or true eyelid ptosis. Attempting to use neuromodulation to solve structural problems is unlikely to produce satisfactory outcomes.

Failing to identify neurological disease

Not every asymmetry is cosmetic. Acute onset, progressive weakness or associated neurological symptoms should always prompt appropriate medical assessment before aesthetic treatment.

Overcorrecting at the first treatment

Dynamic asymmetry often improves substantially with relatively modest alterations in muscle balance. A staged, conservative approach allows refinement at review and minimises the risk of creating a new imbalance.

Focusing on one muscle in isolation

Perhaps the commonest error is considering muscles individually rather than as part of a coordinated functional system. Every treatment plan should consider how modifying one muscle will influence the activity of the surrounding musculature and the overall balance of facial expression.

Looking Ahead

Having explored the intricate balance between the muscles that elevate and depress the brow, we will next turn our attention to the middle third of the face, where dynamic asymmetry becomes even more complex. Unlike the upper face, where individual movements can often be assessed in relative isolation, the midface depends on the coordinated action of multiple muscles that elevate the upper lip, lift the oral commissures and shape the smile. These movements are further influenced by speech, emotion and habitual patterns of facial expression, making careful observation an essential part of clinical assessment.

In Part 3, we will examine the smile complex in detail, exploring the functional anatomy of the upper lip elevators and the muscles that contribute to smile dynamics. We will discuss common presentations such as unilateral gummy smile, uneven upper lip elevation and asymmetric smile, while considering how variations in muscle recruitment, rather than simply muscle strength, influence facial expression. As with the upper face, the emphasis will remain on understanding the underlying pattern of movement before considering treatment, ensuring that neuromodulation is directed towards restoring balance and preserving natural facial expression rather than simply correcting an apparent asymmetry.

Note:

This article was written by a guest contributor from our community. The views and clinical opinions expressed here belong to the author and do not necessarily reflect the opinions or endorsements of Dr Tim Ltd.