Cortical blindness

A. i.e. (Normal pupillary light reflexes with complete visual loss) (306 - Khurana 4th)CORTICAL BLINDNESS* Most common cause is bilateral occipital lobe infarction* Unilateral infarction leads to contralateral homonymous congruous hemianopiaClinical features* Vision and visual fields are markedly decreased* Sparing of the macula with preservation of central vision due to dual blood supply*** Complete visual loss with no light perception.* Pupillary responses are normal** (Pupillary light reflex)* ANTON- SYNDROME i.e. denial of blindness by the patients who obviously cannot see* Riddoch - phenomenon - i.e. ability to perceive kinetic but not static targets