Near Point

Q.

Range of vision for a normal human eye is:

1. 25 cm to infinity

2. 24.5cm to infinity

3. 23cm to 25cm

4. 25cm to 25m

Q.

A student has difficulty reading the black board while sitting in the last row.what is the defect of vision? How can it be corrected?

Q.

What are the near and far points of a healthy human eye?

Q. Which of the following statement is correct?

1. A person with myopia can see distant objects clearly
2. A person with hypermetropia can see nearby objects clearly
3. A person with myopia can see nearby objects clearly
4. A person with hypermetropia can see distant objects clearly

Q. What happens in the case of lazy eye?

Q. Question 14
Which of the following statement is correct?

(a) A person with myopia can see distant objects clearly
(b) A person with hypermetropia can see nearby objects clearly
(c) A person with myopia can see nearby objects clearly
(d) A person with hypermetropia cannot see distant objects clearly

Q.

A convex lens in a human eye adjusts its focal length based on the object position. If it can form a clear image on retina for objects as close as 25 cm and as far as infinite distance, find the range offocal length of lens in the human eye?

Q. What is meant by a distance of distinct vision of a normal human eye? Give its value in cm.

Q.

Name the defect of vision in a person

a) whose near point is more than 25cm away

b) whose far point is less than infinity

Q. Range of vision of a normal human eye is from:

1. 100 m to 25 cm
2. 1 km to 25 cm
3. Infinity to 25 cm
4. Infinity to 25 m

Q.

The student had a difficulty reading the blackboard while sitting in the last row. What is the defect of vision? How can it be corrected?

Q. Choose the correct answer:
The least distance of distinct vision for healthy human eye is:

1. 50 cm
2. 25 cm
3. 15 cm
4. Infinity

Q. What is the far point of a normal human eyes ?

Q. The near point of a normal eye is 25 cm.

1. True
2. False

Q.

The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye is 25 cm)

1. +3 D

2. - 3 D

3. +4 D

4. -4 D

Q.

The sensation of seeing an object remains for about _____ of a second after the object is removed from the view.

1. $\frac{1}{12}$

2. $\frac{1}{16}$

3. $\frac{1}{8}$

4. $\frac{1}{10}$

Q. A student sitting on the last bench in the class cannot read the writting on blackboard clearly but he can read the book lying on his desk clearly. Which of the following statementis correct about the student?

1. The neat point of his eyes has receded away
2. The near point of his eyes has come him to him.
3. the far point of his eyes has receded away.
4. the far point of his eyes has come close to him.

Q. The near point of a normal eye is 25 cm.

1. True
2. False

Q. The near point of hypermetropic eye is 75 cm from the eye. What is the power of the lens required to enable him to read clearly a book held at 25 cm from the eye?

1. +3 D
2. -2.5 D
3. +2.66 D
4. -2.66 D

Q. The nearest point up to which an eye can see objects clearly is called the far point of the eye.

1. True
2. False

Q. The least distance of distinct vision for a young adult with normal vision is about

1. 2.5 m
2. 1 m
3. 0.25 m
4. 25 m

Q. For a normal adult, distance of near point of vision is about:

1. 25m

2. 2.5cm

3. 2.5m

4. 25cm

Q. A short sighted person has a near point of 20 cm and a far point of 45 cm. He can see an object clearly at a distance of:

1. 5 cm
2. 30 cm
3. 10cm
4. 60 cm

Q. The near point of hypermetropic eye is 75 cm from the eye. What is the power of the lens required to enable him to read clearly a book held at 25 cm from the eye?

1. +3 D
2. -2.5 D
3. +2.66 D
4. -2.66 D

Q.

When you are looking at the objects closer to the eye, the focal length of eye lens:

1. Remains same

2. Increases

3. Decreases

4. Fluctuates

Q. The near point of a normal eye is 25 cm.

1. True
2. False

Q.

The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye is 25 cm)

1. +3 D

2. - 3 D

3. +4 D

4. -4 D

Q.

Range of vision for a normal human eye is:

1. 25 cm to infinity

2. 24.5cm to infinity

3. 23cm to 25cm

4. 25cm to 25m

Q.

Isha's eye balls are too short due to which she cannot see

1. Nearby objects

2. Parallel vertical lines

3. Cannot see at all

4. Distant objects

Q. Fill in the blanks
The value of least distance of distinct vision is about _____________.