Question

1. Draw a diagram of visual pathway and explain it.
Indicate the effects of lesions at different levels of
optic pathway.
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Answer 1

Answer:

Any lesion of or posterior to the optic chiasma will result in visual defects in both eyes. A pituitary tumour compressing the optic chiasma and hence the temporal visual field fibres as they cross will result in bitemporal heteronymous hemianopia.

Explanation:

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Answer 2

Answer:

The visual pathway consists of structures that carry visual information from the retina to the brain. Lesions in that pathway cause a variety of visual field defects. In the visual system of human eye, the visual information processed by retinal photoreceptor cells travel in the following way:

Retina→Optic nerve→Optic chiasm (here the nasal visual field of both eyes cross over to the opposite side)→Optic tract→Lateral geniculate nucleus→Optic radiation→Primary and secondary visual cortices.