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Human eye can see objects at different distances with contrasting illu

June 1, 2025 by rawan239

Human eye can see objects at different distances with contrasting illuminations. This is due to

far-sightedness

near-sightedness

far-sightedness and near-sightedness

accommodation of eye

This question was previously asked in

UPSC NDA-2 – 2022

Download PDF Attempt Online

Human eye can see objects at different distances with contrasting illuminations due to the accommodation of eye.

The ability of the eye to adjust its focal length to see objects clearly at different distances is called accommodation. This is achieved by changing the shape of the lens. While “contrasting illuminations” involves other mechanisms like pupil size adjustment (controlled by the iris) and adaptation of photoreceptor cells, “accommodation of eye” is the term that best describes the eye’s overall ability to adjust to different viewing conditions presented in the question, especially the “different distances” aspect, and is the only adaptive mechanism listed among the options.

Far-sightedness and near-sightedness are refractive errors, not adaptive mechanisms. Accommodation primarily refers to focusing for distance, but in a broader sense, the eye’s overall ability to adapt to changing viewing conditions (distance and light) is a form of accommodation or adaptation. Given the options, “accommodation of eye” is the most appropriate answer describing the dynamic adjustment process.

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