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| When an illness or lesion affects the optic nerve before it hits the optic chiasm in the brain, the vision defect appears in one eye only and can change the whole field of the eye. Sometimes people who have a single 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 the disease affects the optic tract after the chiasm, in both eyes, the person will have a vision defect, but the defect will alter the same visual field half. | When an illness or lesion affects the optic nerve before it hits the optic chiasm in the brain, the vision defect appears in one eye only and can change the whole field of the eye. Sometimes people who have a single 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 the disease affects the optic tract after the chiasm, in both eyes, the person will have a vision defect, but the defect will alter the same visual field half. | ||
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