Tear Trough Correction with Hyaluronic Acid: Anatomy, Technique and Safety
The infraorbital hollow is one of the most requested yet least forgiving areas in facial aesthetics. The skin is thin, the vasculature is dense and superficial, and the margin between an elegant result and a lingering complication is measured in millimetres. Correcting the tear trough well demands a clear grasp of anatomy, disciplined patient selection and conservative technique — this article sets out the essentials for clinicians building competence in this region.
Anatomy of the tear trough
The tear trough proper is the medial periorbital depression running obliquely from the medial canthus towards the mid-pupillary line; lateral to this it becomes the palpebromalar groove and the lid–cheek junction. Its appearance is multifactorial: the tear trough ligament tethers skin to the orbital rim, the overlying orbicularis oculi is thin, subcutaneous fat is scant, and age-related bony resorption and descent of the malar fat compartments deepen the shadow.[1][2] Understanding that the hollow is a fixed ligamentous structure — not simply an empty pocket — explains why over-filling to erase it entirely so often disappoints.
Vascular anatomy is the dominant safety concern. Cadaveric mapping has shown that the angular artery lies close to the medial canthus, while the palpebral branch of the infraorbital artery runs close to the inferior tear trough and mid-pupil level, sometimes only two to three millimetres from common injection points.[3] The infraorbital artery anastomoses widely with the angular, dorsal nasal and ophthalmic systems, creating a route for retrograde embolisation to the retinal circulation.[4] There is no truly "safe" plane here — only safer technique.
Patient selection
The ideal candidate has a genuine hollow with good skin quality and minimal fat herniation. Structured assessment helps: dynamic manoeuvres such as tilting, snapping and pulling the lower lid distinguish atrophy from bulging and laxity, and patients whose deformity is driven by pseudoherniated orbital fat or significant lymphatic sluggishness are poor filler candidates.[2][5] Warning signs include prominent eye bags, festoons, malar oedema, marked skin laxity, thyroid eye disease and a history of periorbital swelling — all predict disappointing or complication-prone results. In these cases surgical referral or watchful non-treatment is the responsible option.
Product choice
Product selection materially affects both aesthetics and complication risk. A low-viscosity, low-hydrophilicity hyaluronic acid with modest cross-linking is preferred, since it integrates smoothly, resists overcorrection and draws in less water. Highly hydrophilic or firmly cohesive gels are more likely to produce persistent puffiness in this lymphatically demanding zone.[1] Some products are formulated specifically for the eye contour, combining cross-linked and free hyaluronic acid at low concentration to limit inflammatory and osmotic effects.[1] Whatever the choice, small volumes are the rule — expert recommendations cap treatment at around 0.5 ml per side per session, with review before any top-up.[1]
Injection technique
The consensus target is deep: place hyaluronic acid supraperiosteally, beneath the orbicularis, keeping deposits medial and below the orbital rim rather than up against the lash line.[1][2] Superficial or excessive filling is the root of most aesthetic complications. Practical principles include:
- Inject slowly, in small aliquots of roughly 0.1 ml or less, with continuous attention to resistance and blanching.
- Consider a blunt cannula introduced from a lateral entry point; while it reduces the chance of arterial penetration it does not eliminate it, and needle technique remains legitimate in experienced hands.[3][4]
- Aspirate where using a needle — an imperfect safeguard, not a guarantee — inject on withdrawal, and never deposit a bolus under pressure.
- Undercorrect deliberately and reassess at two to four weeks; the area continues to settle and integrate.[1]
Complications and their management
The Tyndall effect — a bluish-grey discolouration — arises when hyaluronic acid sits too superficially and scatters shorter wavelengths of light. It is best prevented by deep placement and low-viscosity product; established cases respond well to hyaluronidase.[2] Malar oedema presents as persistent, doughy upper-cheek swelling caused by lymphatic obstruction and the hygroscopic pull of filler; limiting volume, choosing a less hydrophilic gel and placing product deep reduce the risk, and dissolving the deposit often resolves it.[1]
The gravest risk is vascular occlusion. Intra-arterial injection into the angular or infraorbital vessels can cause skin necrosis and, through retrograde embolism, irreversible visual loss.[3][4] Every injector must recognise the warning signs — disproportionate pain, immediate blanching, mottling or visual disturbance — and have a rehearsed protocol: stop, and use high-dose hyaluronidase promptly, escalating urgently for any ocular symptoms. Knowing the anatomy, injecting slowly and keeping volumes small are the primary defences.[4]
Closing thoughts
The tear trough rewards restraint. A confident grasp of the ligamentous and vascular anatomy, careful case selection, the right product in small volumes and a deep, unhurried technique will prevent the great majority of problems. Because the tactile feedback and error-correction that keep patients safe cannot be learned from text alone, this region is best approached under the eye of an experienced mentor before you treat independently.
References
- Anido J, Fernández JM, Genol I, Ribé N, Pérez Sevilla G. Recommendations for the treatment of tear trough deformity with cross-linked hyaluronic acid filler. Journal of Cosmetic Dermatology. 2021.
- Sharad J. Dermal fillers for the treatment of tear trough deformity: a review of anatomy, treatment techniques, and their outcomes. Journal of Cutaneous and Aesthetic Surgery. 2012.
- Jitaree B, Phumyoo T, Uruwan S, Sawatwong W, McCormick L, Tansatit T. The feasibility determination of risky severe complications of arterial vasculature regarding the filler injection sites at the tear trough. Plastic and Reconstructive Surgery. 2018.
- Hufschmidt K, Bronsard N, Foissac R, Baqué P, Balaguer T, Chignon-Sicard B, et al. The infraorbital artery: clinical relevance in esthetic medicine and identification of danger zones of the midface. Journal of Plastic, Reconstructive & Aesthetic Surgery. 2019.
- Peng PHL, Peng JH. Treating the tear trough: a new classification system, a 6-step evaluation procedure, hyaluronic acid injection algorithm, and treatment sequences. Journal of Cosmetic Dermatology. 2018.
This article is educational and does not replace formal, supervised clinical training or local regulatory requirements.