Purpose:To design a chart for drawing retinal detachments that minimizes the circum-ferential distortion that occurs with the current chart.
Methods:After trying several standard map projections, a hybrid chart was created. It retains the radial equidistant projection of the current chart from the posterior pole to the equator, but superimposes stereographic projection anterior to the equator. The hybrid chart was put on trial for drawing retinal lesions and planning retinal detachment surgery at the New York Hospital and at the University Eye Clinic in Tubingen in May 1992.
Results:The stereographic projection anterior to the equator has minimized the distortion of retinal breaks and other pathology in the anterior retina when drawn on the chart. Retinal breaks can be drawn as they are seen ophthalmoscopically and estimates of their real dimensions derived from the chart.
Conclusion:A new retinal chart that minimizes circumferential distortion anterior to the equator has proven advantages for planning retinal detachment surgery.
From the *Department of Ophthalmology. The New York Hospital-Cornell Medical Center. New York, and †Department of Ophthalmology. University of Tübingen. Germany.
Presented at the combined meeting of the Club Jules Gonin and the Retina Society, September 5. 1996. Bern, Switzerland.
Supported by the Edward Grayson Fund. West Orange, NJ. and a gift from Senora Salua H. VDA. De Kuri Mexico. D.F.
Reprint requests: Harvey Lincoff. MD, The New York Hospital. 525 East 68th Street. New York, NY 10021.
© The Ophthalmic Communications Society, Inc.