Least distance vision for a person with hypermetropia is:
Correct answer: C. More than 25 cm
- A. 25cm
- B. Less than 25 cm
- C. More than 25 cm
- D. Infinity
Explanation
The closest distance we can see with our eye is 25 cm. This is called the least distance of distinct vision which is the closest distance the lens of our eye can focus light on the retina. Now, if the closest distance a person can see is 35 cm then the least distance of distinct vision of the person has increased. This is called hypermetropia or farsightedness where the person's least distance for distinct vision is increased and he will have difficulty seeing things in the near but he will not have any problem to see the things in the far side. This condition happens because the image is formed behind the retina, not on the retina. Here, the eye lens focuses the incoming light from an object at a point behind the retina. A converging lens is useful to see his surroundings better. If we place a converging lens or convex lens between the eye and the object with the required converging power then the light rays from the object will focus at the retina. That's why a converging lens is used to see properly if someone has hypermetropia.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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