A patient has a right homonymous hemianopia with saccadic pursuit movements and defective optokinetic nystagmus. The lesion is most likely to be in the
Correct Answer: Parietal lobe
Description: Right nomonymous hemianopia with saccadic pursuit movements and detective optokinetic nystagmus confirms the diagnosis of perietal lobe lesion.
Optokinetic Nystagmus: - It can be elicited in all normal individuals.
Defect in optokinetic nystagmus and lesions of brain associated with it.
In a case of hemianopia due to lesions of the parietal lobe optokinetic nystagmus is absent.
Other lesions where optokinetic Nystagmus is defective:-
Frontal lobe lesions - it inhibits this response only temporarily.
Brainstem lesions - it results in asymmetry of this response in vertical plane.
Category:
Ophthalmology
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