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. Author manuscript; available in PMC: 2010 Jun 25.
Published in final edited form as: Exp Eye Res. 2007 Mar 7;85(1):7–14. doi: 10.1016/j.exer.2007.03.001

Figure 8.

Figure 8

Regression of cone ERG amplitude on age among 1039 patients with retinitis pigmentosa in the database of the Berman-Gund Laboratory. Patients were followed for 3–29 years with at least 2 visits separated by 3 or more years. The average rate of decline over the long-term can be described by an exponential function with a mean rate of loss of 8.1% of remaining cone function per year. The rate of decline can also be described by a spline model. Goodness of fit of the exponential model did not significantly differ from that of the spline model.

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