The student likely suffers from myopia, or near-sightedness, a condition where distant objects appear blurry. This occurs when the eye’s shape causes light rays to focus in front of the retina. To correct this, concave (diverging) lenses are used in glasses or contact lenses. These lenses help by diverging light rays before they enter the eye, ensuring they focus directly on the retina, thereby enabling clear vision of distant objects like the blackboard.

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Identifying and Correcting a Common Vision Problem in Students

Probable Vision Impairment: Myopia: A student struggling to read the blackboard from the back of the classroom is likely experiencing myopia, commonly known as near-sightedness. This condition impairs the ability to see distant objects clearly while close objects remain in focus.

Understanding Myopia

Myopia occurs when the eyeball is slightly elongated or the cornea has too much curvature. This structural alteration causes light rays to focus in front of the retina instead of directly on it, resulting in a blurred image of distant objects.

Symptoms in an Educational Setting

In a classroom environment, myopia manifests as difficulty in seeing the blackboard or projector screen clearly from a distance. Students may squint or strain their eyes, and often need to sit closer to the front to see clearly.

Corrective Measures: Concave Lenses

The most common and effective correction for myopia involves using concave lenses, either in glasses or contact lenses. These lenses are designed to diverge light rays, extending their focal point to reach the retina properly.

How Concave Lenses Work

When placed before a myopic eye, a concave lens spreads out the incoming light rays. This adjustment allows the light to focus on the retina, clearing up the image of distant objects. The strength of the lens is determined based on the severity of the myopia.

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Ensuring Clear Vision for Learning

By wearing glasses or contact lenses with the appropriate concave lenses, the student can regain clear vision for distant objects. This correction is crucial for academic performance and comfort, allowing the student to participate fully in classroom activities without visual hindrance.

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Questions of 10th Science Chapter 10 in Detail

What is meant by power of accommodation of the eye?
A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
What is the far point and near point of the human eye with normal vision?
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision, and (ii) near vision?
The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect?
Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
What happens to the image distance in the eye when we increase the distance of an object from the eye?
Why do stars twinkle?
Explain why the planets do not twinkle?
Why does the sky appear dark instead of blue to an astronaut?