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The Hess chart has been used since 1908 to diagnose paralytic and mechanical ocular deviations and to provide a reliable and repeatable record of the condition.1, 2Although many techniques to obtain Hess charts have been described,3the Lees screen, which uses a 2-sided mirror to obtain dissociation,4is one of the most commonly used.What are the features of neurogenic defects on Hess chart?. What are the features of mechanical defects on Hess chart? aa 13. What information may be obtained by analysing the outer field? aa 12.
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The Hess chart contains a central and outer field. used in management of paralytic squint How can one use Hess chart for measuring the ocular deviation? aa 11.