During medical procedure, useing very pure air and water, air to hold the reina in place during Virectomy.

.sigmaaldrich.com/US/en/ Milli-Q® Direct Water Purification System (say Ultrapure for surgery , am supposing)

ncbi.nlm.nih.gov/pmc/articles/PMC2683478/ "Supplementing oxygen-treated vitreous with ascorbate restored its ability to consume oxygen in a dose-dependent manner (Figure 2A, solid triangles and solid squares). Ascorbate dissolved in water purified*** by ion exchange*** chromatography and reverse osmosis (Milli-Q water purifier; Millipore Corp) did not consume detectable quantities of oxygen (Figure 2A, solid diamonds). Ascorbate levels decreased substantially during exposure of vitreous to oxygen, indicating that ascorbate was consumed during exposure (Figure 2B).

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8081592/

Postoperative data collected included PPV surgery platform (25- or 23-gauge), intraoperative retinal tamponade (air, C3F8 12% or SF6 20%, SiO), cataract extraction at the time of PPV, anatomical primary success rate, BCVA, presence of metamorphopsia (detected with Amsler grid), intraocular pressure (IOP measured by Goldmann applanation tonometer), and any others intraoperative or postoperative complications. Patients were routinely followed up at 1, 3, and 6 months after surgical procedures. Autofluorescence imaging (FAF) and spectral-domain optical coherence tomography (SD-OCT) were performed three weeks after surgery in case of air or SF6 tamponade and six weeks after surgery in case of C3F8 tamponade. In case of SiO using, FAF and SD-OCT were obtained one month after its surgical removal.

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Note added at 2 hrs (2024-02-06 18:32:22 GMT)
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links https://www.sigmaaldrich.com/US/en/substance/milliqdirectwat...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2683478/