Method and apparatus for measuring contrast sensitivity

摘要: A novel contrast sensitivity test utilizing an adaptive threshold algorithm is proposed. The embodied as a two-alternative forced choice examination using grating stimuli of randomly interleaved spatial frequencies. stimulus's orientation either tilted to the left or right vertical. During examination, succession presented subject, and subject asked indicate each stimulus. level for next stimulus varied depending on subject's response previous one weighted up-down algorithm. For correct response, reduced, whereas incorrect increased. Importantly, amount by which lowered different from it raised, progresses, changes. maximum likelihood method then employed finding best estimation responses known levels.