Chapter 243 Any abnormality of the PLRs should be characterized (ranging from a mild decrease to complete absence) and qualified as an afferent or efferent deficit. Afferent PLR deficits are associated with vision deficits. The pupillomotor fibers split off from the optic tract just before the lateral geniculate nucleus; therefore lesions involving the Edinger-Westphal nucleus (the parasympathetic nucleus of cranial nerve III) and the efferent arm of the PLR pathway are not associated with loss of vision (Figure 243-1). Lesions that involve the visual pathway from the lateral geniculate nucleus to the optic striations in the visual cortex do not cause abnormalities of the PLR or anisocoria (Figure 243-2).
Evaluation of Blindness
Assessing the Patient
< div class='tao-gold-member'>
Evaluation of Blindness
Only gold members can continue reading. Log In or Register a > to continue

Full access? Get Clinical Tree

