Figure 2

In this figure a score of 95 indicates that 50% of respondents can drive without difficulty during at night in regards to their visual function. A score of 32 indicates that 50% of respondents have no difficulty recognizing people when they are close. This interpretation provides clinicians and patients with guidance what they can expect based on a score on a multi-item instrument. The approach is restricted to instruments with a clear gradient of severity across the instruments' items.