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.
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- Laser speckle contrast imaging (LSCI) enables perfusion monitoring of the anterior segment during strabismus surgery: a study on the horizontal rectus muscles