The Snellen letter chart is commonly used to test for which aspect of visual function?

• A. Color blindness
• B. Visual acuity
• C. Peripheral vision
• D. Depth perception

Answer: (B)

Verified step by step guidance

1. Understand that the Snellen letter chart is a tool used in vision testing, specifically designed to measure how well a person can see details at a distance.
2. Recognize that 'visual acuity' refers to the sharpness or clarity of vision, which is exactly what the Snellen chart assesses by having individuals read letters of decreasing size from a set distance.
3. Note that other options like color blindness, peripheral vision, and depth perception are tested using different methods and tools, not the Snellen chart.
4. Recall that color blindness tests typically involve Ishihara plates, peripheral vision is assessed with visual field tests, and depth perception is evaluated through stereopsis tests.
5. Conclude that the Snellen letter chart is primarily used to test visual acuity, which is the ability to discern fine details clearly.