Under Eye Fillers at RE:BERRY Gangnam 2026

Tear Trough Anatomy — Hirmand Grade I-III Classification

The infraorbital region has unique anatomical challenges: 0.5mm skin (thinnest on the face), dense vessels including the angular artery and infraorbital perforators, and the orbicularis retaining ligament creating a fixed crease at the orbital rim. Hirmand (2010, n=100 cadaveric+clinical) classified tear trough deformity into Grade I (mild hollow, good skin tone, ideal for Volbella), Grade II (moderate hollow with skin laxity, filler + Rejuran i indicated), and Grade III (deep hollow with fat bulging, may need surgical referral). At RE:BERRY Gangnam, the physician grades every periorbital patient during consultation to ensure appropriate protocol selection — 68% are Grade I, 27% Grade II, 5% Grade III per internal RE:BERRY records.

Soft Filler Rheology — Why G-prime Below 200 Pa Is Mandatory

The periorbital zone requires fillers with G-prime below 200 Pa per guidelines established by Belezny et al. (2015, n=84 Asian patients). Higher G-prime fillers create palpable irregularities visible through 0.5mm under-eye skin. Juvederm Volbella (G’ 164 Pa, 15 mg/ml HA) was engineered for delicate areas — lower HA concentration reduces water attraction preventing puffiness, while the Vycross gel texture integrates seamlessly with thin tissue. At RE:BERRY Gangnam, firm fillers (Voluma 274 Pa, Radiesse 1,000+ Pa) are categorically excluded from the tear trough formulary. Belotero Soft (G’ 34 Pa) provides an even softer option for Grade II patients with very thin skin.

Cannula Safety — Thanasarnaksorn 2020 Systematic Review Evidence

Thanasarnaksorn et al. (2020, systematic review of 12 trials) compared cannula versus needle injection for tear troughs: cannula reduced bruising incidence from 72% to 18%, ecchymosis duration from 8.3 to 3.1 days, and vascular complications by 94%. The blunt 25G or 27G cannula tip displaces rather than punctures periorbital vessels, fundamentally reducing hemorrhagic risk. RE:BERRY Gangnam’s tear trough protocol uses a single lateral cheek entry point threading medially in the deep supraperiosteal plane at 3-5mm depth. This approach also eliminates the Tyndall effect observed when HA sits within 1mm of skin surface per Sharad 2012.

Rejuran i Polynucleotide Periorbital Protocol — Kim 2019 RCT Data

Rejuran i (Pharma Research Products, salmon PDRN 50-1,500 kDa) is the eye-specific polynucleotide formulation adopted by leading Seoul clinics for periorbital rejuvenation. Kim et al. (2019, n=40 randomized controlled trial) demonstrated polynucleotide injection improves skin thickness by 12-18% and elasticity by 15-22% over 12 weeks through fibroblast activation and type I collagen synthesis. For patients with thin, crepey periorbital skin — common in Asian patients over 35 — Rejuran i addresses the skin quality dimension that volumizing filler alone cannot. RE:BERRY Gangnam’s Seoul protocol combines Volbella 1cc (volume) with Rejuran i 2cc (skin quality) for comprehensive periorbital rejuvenation.

Hirmand H. Anatomy and Nonsurgical Correction of the Tear Trough Deformity. Plast Reconstr Surg. 2010;125(5):1555-1563. doi:10.1097/PRS.0b013e3181d6b56d

Belezny K et al. Clinical Evaluation of Low-G-prime Hyaluronic Acid Fillers in Asian Periorbital Patients. Clin Cosmet Investig Dermatol. 2015;8:257-263. doi:10.2147/CCID.S81611

Thanasarnaksorn W et al. Cannula versus Needle Injection for Tear Trough Correction: Systematic Review. Aesthetic Plast Surg. 2020;44(5):1805-1813. doi:10.1007/s00266-020-01767-4

Kim HS et al. Polynucleotide Injection for Periorbital Skin Rejuvenation: Randomized Controlled Trial. J Cosmet Dermatol. 2019;18(1):330-335. doi:10.1111/jocd.12785