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Implantation Protocol of the Foldable Capsular Vitreous Body for Complex Vitreoretinal Surgery

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Published on: April 14, 2026

Weekend Effect on Vitrectomy: Insights from a Nationwide Population-Based Study in Korea.

Min Seok Kim¹, Eunjeong Ji²

¹Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea, mutjina@snu.ac.kr.

Ophthalmologica. Journal International D'Ophtalmologie. International Journal of Ophthalmology. Zeitschrift Fur Augenheilkunde

|May 30, 2026

Summary

Weekend or holiday vitrectomy surgery does not increase reoperation risk compared to weekday procedures. This nationwide study found no significant difference in reoperation rates, indicating no weekend effect for vitrectomy outcomes.

Keywords:

Administrative claims data Health care quality Reoperation Retinal surgery Vitrectomy Weekend effect

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Whole Vitreous Humor Dissection for Vitreodynamic Analysis

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Published on: May 24, 2015

Area of Science:

Ophthalmology
Surgical Outcomes
Health Services Research

Background:

The

Purpose of the Study:

To investigate whether weekend/holiday vitrectomy surgery impacts reoperation rates compared to weekday surgeries.
To assess the association between timing of vitrectomy surgery and short-term reoperation risk.

Main Methods:

A nationwide, population-based retrospective cohort study utilizing the Korean Health Insurance Review and Assessment Service database.
Inclusion of 387,544 adult patients who underwent initial vitrectomy between January 2011 and March 2024.
Comparison of reoperation rates within 90 and 180 days using Cox proportional hazards regression and logistic regression, with subgroup analyses for common diagnoses.

Main Results:

Reoperation rates per 100 person-months were similar: 2.83 for weekend/holiday and 2.87 for weekday surgeries.
Weekend/holiday surgery was not significantly associated with reoperation within 90 days (aHR, 1.00) or 180 days (aHR, 1.02).
Subgroup analyses showed no increased reoperation risk for weekend/holiday surgery, except for vitreous hemorrhage within 180 days (aHR, 1.09).

Conclusions:

Vitrectomy surgery is not associated with a "weekend effect" regarding reoperation rates.
The timing of vitrectomy surgery (weekend/holiday vs. weekday) does not significantly influence short-term reoperation risk.
These findings suggest consistent surgical care quality regardless of the day of the week for vitrectomy.