Blindness over half the field of vision is known as which condition?

Blindness over half the field of vision is known as which condition?

• A. Diplopia
• B. Hemianopia
• C. Monochromatism (Color Blindness)
• D. Photophobia

Answer: (B)

The main idea tested is a pattern of visual field loss. When half of the field of vision is lost, the term used is hemianopia. This typically results from a brain lesion after the optic chiasm, affecting the opposite side of the visual field in both eyes. For example, damage on the left side of the brain often causes a loss of the right half of the visual field in both eyes, known as right homonymous hemianopia. This distinguishes it from other terms: diplopia means double vision, not a restricted field; monochromatism (color blindness) relates to color perception; and photophobia is sensitivity to light.

The main idea tested is a pattern of visual field loss. When half of the field of vision is lost, the term used is hemianopia. This typically results from a brain lesion after the optic chiasm, affecting the opposite side of the visual field in both eyes. For example, damage on the left side of the brain often causes a loss of the right half of the visual field in both eyes, known as right homonymous hemianopia. This distinguishes it from other terms: diplopia means double vision, not a restricted field; monochromatism (color blindness) relates to color perception; and photophobia is sensitivity to light.