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What do you understand by presbyopia and astigmatism?

Important Questions on The Human Eye and the Colourful World

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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
What are the defects of vision? A person needs a lens of power, -5.5 D for correcting his distant vision. For correcting his near vision, he needs a lens of power, +1.5 D. What is the focal length of the lens required for correcting distant vision?
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
What is myopia? How it is corrected?
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
What is meant by power of accommodation of eye?
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
Write the function of cornea of human eye.
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
Draw the ray diagram to show how hypermetropia is corrected.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? Assume that the near point of the normal eye is 0.25 m.
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision

A short sighted person uses a spectacle of power -0.4 D to see very distant objects. How far can he see without using spectacle?

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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
Shyam a student has difficulty reading the blackboard while setting in the last row. What could be the defect the child is suffering from? How can it be corrected? Explain with help of appropriate diagram.
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
A student is unable to see clearly the words written on the black board placed at a distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it.
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
Write the function of ciliary muscles of human eye.
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision

A student sitting on the last bench of a regular classroom is able to see the written work on a blackboard but unable to read from his textbook. Identify the type of defect of vision he is suffering from. What kind of lens should he wear to correct the defect?

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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
Write the function of crystalline lens of human eye.
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
What is Presbyopia? Draw the ray diagram to show how Myopia is corrected.
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of 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? Why do we have two eyes for vision and not just one?
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
What do you understand by the term accommodation of the eye?
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision

Which defect of the eye is shown in the figure given below?

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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision

In the given diagram which defect of the human eye is being corrected using a concave lens?

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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
When do we consider a person to be myopic or hypermetropic? List two causes of hypermetropia. Explain using ray diagrams how the defect associated with hypermetropic eye can be corrected.
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
Write the function of iris of human eye.
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Science>Physics>The Human Eye and the Colourful World>Human Eyes and Defects of Vision
The change in focal length of an eye-lens is caused by the action of the_____.