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| optic_chiasma [2026/09/03 13:40] – Tags: controlled vocabulary for sidebar and tag index andrewtaustin | optic_chiasma [2026/09/03 16:10] (current) – Tag line moved to the foot of the page so it no longer starts the meta description andrewtaustin | ||
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| ====== The Optic Chiasm ====== | ====== The Optic Chiasm ====== | ||
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| When an illness or lesion affects the optic nerve before it reaches the optic chiasm in the brain, the vision defect appears in one eye only and can affect the entire visual field of that eye. Sometimes people with a unilateral defect do not realise it until one eye is covered. This is because each eye's overlapping visual fields will mask the deficiency when both eyes are open. If a disease affects the optic tract after the chiasm, the person will have a visual defect in both eyes affecting the same half of the visual field. | When an illness or lesion affects the optic nerve before it reaches the optic chiasm in the brain, the vision defect appears in one eye only and can affect the entire visual field of that eye. Sometimes people with a unilateral defect do not realise it until one eye is covered. This is because each eye's overlapping visual fields will mask the deficiency when both eyes are open. If a disease affects the optic tract after the chiasm, the person will have a visual defect in both eyes affecting the same half of the visual field. | ||
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