Electroretinograms Recorded with Skin Electrodes from Post-Vitrectomy Silicone Oil Filled Eyes with Proliferative Diabetic Retinopathy

Figures & data

Table 1 Demographics of Patients

Age (Years)	57.6 ± 7.5
Sex (F/M)	2 / 6
Visual acuity (log MAR units)
Before SOR	1.05 ± 0.59
After SOR	0.56 ± 0.32
Duration of SO tamponade (days)	210.5 ± 159.3
Vitreoretinal pathology*
TRD	7
Combined TRD and RRD	1

Notes: Data is shown as mean ± standard deviation. *All eyes had proliferative diabetic retinopathy. *RD involved macula in all eyes.

Abbreviations: F, female; M, male; SOR, silicone oil removal; log MAR, logarithm of the minimum angle of resolution; TRD, tractional retinal detachment; RRD, rhegmatogeneous retinal detachment.

Table 2 The Visual Acuity and Electroretinographic Parameters Before and After Silicone Oil Removal

Case	Visual Acuity				ERG Parameter
					Amplitude (uV)				Implicit Time (msec)
	Before SOR		After SOR		Before SOR		After SOR		Before SOR		After SOR
	Decimal VA	logMAR	Decimal VA	logMAR	a Wave	b Wave	a Wave	b Wave	a Wave	b Wave	a Wave	b Wave
1	0.1	1.00	0.4	0.40	−7.7	8.2	−10.9	18.7	12.1	40.1	19.7	64.9
2	0.2	0.70	0.3	0.52	−1.6	2.7	−11.8	15.6	24.3	60.9	20.5	51.5
3	0.01	2.00	0.06	1.22	0	0	0	0	n.a.	n.a.	n.a.	n.a.
4	0.4	0.40	0.6	0.22	−18.6	19.8	−6.4	19.6	19.6	50.3	16.5	59.2
5	0.09	1.05	0.15	0.82	0	0	0	0	n.a.	n.a.	n.a.	n.a.
6	0.01	2.00	0.2	0.70	0	0	0	0	n.a.	n.a.	n.a.	n.a.
7	0.2	0.70	0.4	0.40	0	0	0	0	n.a.	n.a.	n.a.	n.a.
8	0.3	0.52	0.6	0.22	−10.8	10	−17.8	28.9	22.9	51.5	20.1	62
Average*	0.09	1.05	0.273	0.56	−4.84	5.09	−5.86	10.35	19.73	50.70	19.20	59.40
Standard deviation		0.587		0.318	6.493	6.704	6.528	10.93	4.721	7.369	1.584	4.986

Notes: *Geometric mean is shown as an average for decimal VA.

Abbreviations: SOR, silicone oil removal; n.a., not applicable; VA, visual acuity; log MAR, logarithm of minimal angular resolution.

Figure 1 Findings in a 53-year-old woman who had ERG responses in her silicone (SO) filled eye. (A) Fundus photograph of the left eye after the SO removal. (B) Optical coherence tomographic (OCT) image of the left eye after the SO removal. (C) Combined rod-cone response before SO removal. (D) Combined rod-cone response after SO removal. The decimal visual acuity improved from 0.3 to 0.6 (from 0.52 to 0.22 logarithm of the minimum angle of resolution; logMAR units) after the SO removal.

Figure 2 Representative ERGs of a 49-year-old man whose ERG was flat in the SO filled eye. (A) Fundus photograph of the right eye after the SO removal. (B) OCT image of the right eye after the SO removal. (C) Combined rod-cone responses before the SO removal. (D) Combined rod-cone responses after the SO removal. The decimal visual acuity improved from 0.2 to 0.4 (from 0.70 to 0.40 logarithm of the minimum angle of resolution; logMAR units) after the SO removal.