Forty-four eyes with horizontal strabismus surgery involving medial and / or lateral rectus muscle detachment were recruited. The perfusion in the adjacent paralimbal and iris tissue was monitored with LSCI technique, by using a PeriCam PSI NR System. An infrared 785nm laser beam is dispersed over the skin regions to interest by a diffuser. The variation in the pattern caused by moving red blood cells was analysed, allowing the blood perfusion to be measured in arbitrary units (perfusion units). There was a decrease in perfusion in the adjacent paralimbal tissue of 23% when the first horizontal rectus muscle was detached, and 12% by the second muscle. The iris perfusion decreased by 5% when the first muscle was detached but no significant decrease by the second muscle detachment. The authors concluded that in this cohort, there was only a small decrease in the anterior segment perfusion after two horizontal rectus muscles detachment. Further studies are needed on multiple muscles surgery for the complete mapping of the anterior segment perfusion.
Laser speckle contrast imaging (LSCI) enables perfusion monitoring of the anterior segment during strabismus surgery: a study on the horizontal rectus muscles
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