Considerations of contrast sensitivity function of low vision

For people with low vision, contrast is extremely important to comprehend visual information of products and signs. For better design of products and services, this study is aimed at establishment of a database of contrast sensitivity functions (CSFs) of people with low vision. The CSFs of participants (72 people with low vision) were measured. The measured contrast sensitivity function showed large variation among individuals - ranging from the normal sensitivity level to a much lower level - with no representative function, but revealing a clear sensitivity decrease at the higher spatial frequency region greater than 1 cpd when compared with data of normal younger and older people. Results show that spatial discrimination of detailed objects is much worse for people with low vision. The data analyses were conducted along with classification using medical tests.