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Silicone Study Report 9

John Lean, MD; Stanley P. Azen, PhD; Pedro F. Lopez, MD; Dajun Qian, MS; Mei-Ying Lai, MS; Brooks McCuen, MD; Silicone Study Group

Arch Ophthalmol. 1996;114(3):286-292.

Abstract
Objective
To evaluate the reproducibility and the prognostic utility of the Retina Society and Silicone Study Classification Systems in eyes after surgery for severe proliferative vitreoretinopathy (PVR).

Design
Subgroup analysis of the Silicone Study—a randomized, multicentered, surgical trial.

Setting
Community and university-based ophthalmology clinics.

Materials
Three hundred forty eyes with preoperative and intraoperative evaluations using both systems of grading PVR (reproducibility study), and 287 eyes with preoperative and intraoperative evaluations using both systems of grading PVR and with a 24-month follow-up examination (prognosis study).

Interventions
Vitrectomy for PVR with long-acting perfluoropropane gas or silicone oil as the intraocular tamponade.

Outcome Measures
Retinal reattachment, visual acuity (5/200), intraocular pressure, corneal clarity, and the need for reoperation.

Results
The reproducibility of the Silicone Study Classification System was 64% (type of contraction), 77% (number of clock hours), 67% (posterior PVR), 88% (anterior and posterior PVR), and 94% (anterior, posterior, and subretinal PVR). The reproducibility of the Retina Society Classification System was 99%. Using the Silicone Study Classification System, location of PVR predicted visual acuity (P=.004, ² test for trend) and hypotony (P=.03, ² test for trend). Using the Retina Society Classification System, the grade of PVR predicted only visual acuity (P=.01, ² test for trend). For eyes with anterior and posterior PVR, there was a decreasing trend in successful visual acuity outcome with increasing severity of PVR (from C-3 to D-3, P=.02, ² test for trend).

Conclusions
Although the classification of PVR using the Silicone Study Classification System was not reproducible for the type of contraction or for posterior PVR, identification of the anteroposterior extent of the PVR was prognostic of visual acuity and hypotony at 24 months. The joint knowledge of the location of PVR (using the Silicone Study Classification System) and the tightness of the funnel for retinas with 9 to 12 clock hours involved by fixed folds (using the Retina Society Classification System) has prognostic utility for eyes with anterior and posterior PVR.

Author Affiliations
From the Doheny Eye Institute (Drs Lean and Lopez) and the Department of Preventive Medicine (Dr Azen, Mr Qian, and Ms Lai), University of Southern California, Los Angeles; the Department of Ophthalmology, Duke University Eye Center, Durham, NC (Dr McCuen); for the Silicone Study Group. A list of the participants in the Silicone Study Group appears at the end of Silicone Study Report 1 (Arch Ophthalmol. 1992;110:770-779).

Footnotes
None of the authors or investigators in the Silicone Study Group have a proprietary interest in the products mentioned in this article.

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