Optokinetic Nystagmus (OKN) may be used as an objective measurement of vision in an otherwise non-responsive or malingering patient. It is useful in pediatric cases to determine the presence or absence of vision. A positive nystagmus response consists of a … Continued
For determining objective and subjective convergence points and measuring accommodation. Consists of a lightweight bar, 500 mm in length on which a sliding four-sided drum is mounted, with a different test on each panel.