1. A method comprising: receiving data characterizing a result of a first visual sensitivity test assessing capacity to detect spatial form across one or more different target sizes and different contrasts, the results of the first visual sensitivity test characterizing a line generated on a spatial frequency image that indicates a transition between a visible contrast and an invisible contrast; determining, using the received data, one or more first parameters defining a first estimated visual sensitivity for a first range of contrasts and a second range of spatial frequencies; determining, using the one or more first parameters and a statistical inference, one or more second parameters defining a second estimated visual sensitivity for a third range of contrasts and a fourth range of spatial frequencies by at least presenting a first visual stimulus, receiving a response, and determining a second visual stimulus based at least on the response and at least a rule; and providing the one or more second parameters.