1. A method comprising: receiving data that includes visual threshold sensitivity information as a function of location within a visual field; determining, from the data and a connection strength model, connection strengths between points within the visual field; determining, from the data and a noise measure model, noise values across the visual field; and determining a probabilistic model representing threshold sensitivities across the visual field, the probabilistic model determined based on the data, the connection strengths, and the noise values.