Flight Surgeon Module B Practice Test

Which vision type describes night vision with rods only?

Photopic Mesopic Scotopic None

Correct Answer:

Scotopic

Explanation:

The concept is rod-dominated, low-light vision. Scotopic vision describes this state where rods are the primary active photoreceptors in dim conditions. Rods are extremely sensitive to light, which lets you see at night, but they give grayscale vision and poorer detail since they do not convey color. Cones, which provide color and sharp detail, require more light and hence operate mainly in photopic (daylight) vision. In between, mesopic vision is when both rods and cones contribute. So night vision with rods only is scotopic vision.

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