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What is Lesion at which pa of visual pathway causes homonymous hemianopia? and explain in detail?
A left homonymous hemianopsia can be caused by a lesion in the right optic tract or the right side of the brain. With a tract lesion, the pupillary reflex is lost if light is only projected from the blind hemifield; the pupil reacts when the lesion is posterior to the geniculate body in the optic radiations or occipital lobe. Transient homonymous hemianopsia may occur with migraine. Ref: LeBlond R.F., DeGowin R.L., Brown D.D. (2009). Chapter 7. The Head and Neck. In R.F. LeBlond, R.L. DeGowin, D.D. Brown (Eds), DeGowin's Diagnostic Examination, 9e.