A patient has damage at the optic chiasm. Which visual field change is most likely if the crossing nasal fibres are affected?
Correct answer: A. Loss of the outer fields of both eyes
- A. Loss of the outer fields of both eyes
- B. Loss of the inner fields of both eyes
- C. Loss of vision in the right eye only
- D. Loss of vision in the left eye only
Explanation
Nasal retinal fibres cross at the optic chiasm and carry information from the temporal, or outer, visual fields. Damage at the chiasm therefore commonly causes loss of the outer fields of both eyes.
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About Nervous System and Special Senses
The nervous system covers neurons, neuroglia, nerve impulses, synapses, reflex arcs, and the organization of the central and peripheral nervous systems. It also explains the autonomic divisions and the receptors and pathways for vision, hearing, balance, taste and smell, distinguishing sensory reception from conscious perception.
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