_________ is a condition characterized by an abnormal inability to see in dim light or at night.
Correct answer: A. Nyctalopia
- A. Nyctalopia
- B. Myopia
- C. Hyperopia
- D. All of the above
Explanation
Nyctalopia, or night blindness, is difficulty seeing in dim light and is commonly associated with inadequate vitamin A or impaired rod-cell function. Students may choose myopia or hyperopia because both affect vision, but they are focusing defects rather than inability to see at night.
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About Receptors
Receptors are specialized cells or proteins that detect stimuli such as light, sound, pressure, temperature and chemicals, then initiate responses through sensory or hormonal pathways. Questions distinguish sensory receptors from effectors, compare receptor types, and examine stimulus conversion into nerve impulses, including the roles of rods, cones, chemoreceptors and mechanoreceptors.
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