What the research shows
What makes bags. Bags under the eyes have no single cause: a hollow where lid meets cheek, bulging fat, loose skin, fluid, an active lid muscle and cheek festoons all contribute in different amounts, so treatment has to match the patient (Goldberg 2005). The tear trough shows because the skin and fat over it thin with age, not because it falls, and bulging fat above makes it deeper (Haddock 2009). The bony rim under the eye also moves back with age; removing too much fat then makes the eye look more prominent, and eyes that sit forward of the cheek are a warning sign before surgery (Pessa 1999).
Inside the lid or below the lashes. The approach from inside the lid leaves no visible scar and avoided the pulled-down lid that is the most common complication of the skin approach (Baylis 1989). It flattened bags in nearly every patient but left wrinkles worse in almost half; adding CO2 laser resurfacing treated the wrinkles (Carter 2001). Among surveyed oculoplastic surgeons, nearly all use the inside approach, most move fat, and nearly all use outer corner support, at least for some patients (Kossler 2018).
Keeping the lid in place. With the skin approach and routine support of the outer corner, about 1 patient in 30 needed surgery for a lid out of position and about 1 in 8 had swelling of the eye surface (Codner 2008). One surgeon using the skin approach without routine support, but tightening lids that were loose before surgery, saw a symptomatic lid problem in about 1 patient in 250 (Maffi 2011).
What to do with the fat. For deeper tear troughs, moving the patient's own lid fat into the hollow worked better than injecting fat (Chiu 2017). Small fat grafts laid along the trough narrowed it more than moving fat, with the same complication and revision rates (Hedén 2021); minced fat grafts and attached fat flaps did equally well (Karimi 2023). Placing moved fat under or over the bone covering gave the same final result, with less bruising when placed under it (Yoo 2013).
Safety and recovery. A review found no reported complications that harmed vision, and most problems were fixed with simple care or a small revision (Gimenez 2025). Long-lasting swelling of the eye surface was more common after the skin approach with outer corner surgery than after the inside approach (Di Maria 2024), and cutting with a CO2 laser caused less of it than electrosurgery (Chen 2023).
Where surgeons disagree
- Routine outer corner support. One surgeon advises it for every skin-approach operation (Codner 2008); another found it unnecessary when lid tone is good (Maffi 2011); corner surgery is linked to more lasting eye-surface swelling (Di Maria 2024).
- Which approach. A split-face comparison found the inside and skin approaches graded the same (Netscher 1995), yet every patient referred to one practice for a pulled-down lid had had the skin approach (Griffin 2014).
- Moving fat or grafting it. Results favored moving fat (Chiu 2017), grafting it (Hedén 2021), or neither (Karimi 2023).
What is new
- An extended inside approach releases the ligament under the tear trough and grafts the patient's removed lid fat along the rim; no lid was pulled down, the eyes looked better when smiling, and about 1 patient in 100 needed a revision (Wong 2026).
- For very large bags, removing deep fat while moving the rest cleared bags and hollows in most patients (Chen 2026).
- Botox injected at the end of a skin-approach operation narrowed the scar in Asian patients (Huang 2021).
What is still unknown
- Which technique is best; the field needs more rigorous comparative studies (Gimenez 2025).
- How results hold over many years; most comparisons follow patients for about a year (Karimi 2023, Hedén 2021).
Key papers
- Baylis 1989: the inside approach avoided a pulled-down lid.
- Pessa 1999: bone changes and the prominent-eye warning sign.
- Goldberg 2005: bags have several causes.
- Codner 2008: skin approach with routine outer corner support.
- Haddock 2009: the anatomy of the tear trough.
- Maffi 2011: the skin approach without routine support, over 30 years.
- Kossler 2018: how oculoplastic surgeons operate today.
- Hedén 2021: fat grafts against moved fat for the tear trough.
- Wong 2026: the extended inside approach over two years.