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Dehydration injury as a possible cause of visual field defect after pars plana vitrectomy for macular hole.

PURPOSE: To present the hypothesis that a visual field defect after pars plana vitrectomy for macular hole may be caused by dehydration injury to the nerve fiber layer during the fluid-air exchange.

METHODS: In a consecutive nonrandomized series of 45 operations on 35 eyes of 34 patients with full-thickness macular hole, the surgical method was changed with postoperative visual field testing performed.

RESULT: The incidence and location of the post-operative visual field defect was affected only by changing the location of the infusion cannula.

CONCLUSION: Dehydration injury of the nerve fiber layer during the fluid-air exchange should be considered as a possible cause of visual field defect after pars plana vitrectomy for macular hole.

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