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[Use of the multifocal electroretinogram to evaluate retinal function after pars plana vitrectomy for diabetic
M Hosokawa1, K Sakagami, K Hongu
1Department of Ophthalmology, Ehime University School of Medicine, Japan.
Purpose:
Multifocal electroretinograms (multifocal ERGs) were performed to evaluate retinal function in patients with diabetic macular edema.
Materials & Methods:
Eight eyes of 5 patients underwent pars plana vitrectomy for diabetic macular edema. Multifocal ERGs, fundus examinations, and fluorescent angiographies were done both before and after the operation.
Results:
Post-operative visual acuity was improved by two or more lines in 3 eyes. In multifocal ERGs, the amplitude of the positive wave (P1) from the macular area decreased transiently after surgery (p < 0.05), but it improved with the passage of time. The P1 amplitude from the peripheral area was decreased throughout the observation period of six months (p < 0.05). For both areas, the P1 latency was increased significantly (p < 0.05) at one month post-operatively, and then decreased.
Conclusion:
These findings are consistent with the possibility that the surgical method, especially removal of the posterior cortical vitreous, can cause retinal damage.