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Power of Accommodation of Human Eyes | Class 10th Science Video Video Lecture
FAQs on Power of Accommodation of Human Eyes - Class 10th Science Video Video Lecture
| 1. What is the power of accommodation of human eyes? |  |
Ans. The power of accommodation of human eyes refers to the ability of the eye lens to adjust its focal length in order to focus on objects at different distances. It allows us to see objects clearly at both near and far distances.
| 2. How does the power of accommodation of human eyes work? | |
Ans. The power of accommodation is achieved through the process of accommodation, where the ciliary muscles surrounding the lens contract or relax to change the shape of the lens. When we focus on a nearby object, the ciliary muscles contract, making the lens thicker, which increases its refractive power. Conversely, when we focus on a distant object, the ciliary muscles relax, making the lens thinner, which decreases its refractive power.
| 3. What factors affect the power of accommodation of human eyes? | |
Ans. Several factors can affect the power of accommodation of human eyes. These include age, eye diseases or conditions such as presbyopia, myopia, hyperopia, and astigmatism, as well as certain medications. Age-related changes in the lens, such as loss of elasticity, can reduce the power of accommodation.
| 4. Can the power of accommodation of human eyes be improved? | |
Ans. The power of accommodation can be improved to some extent through exercises and activities that strengthen the ciliary muscles. These exercises involve focusing on objects at different distances and changing focus frequently. However, it is important to note that the power of accommodation naturally decreases with age and cannot be fully restored once it starts declining.
| 5. How is the power of accommodation of human eyes tested? | |
Ans. The power of accommodation of human eyes can be tested using a device called a near point ruler or a handheld reading card. The individual is asked to focus on a small letter or object at a specific distance and slowly move it towards their eyes. The point at which the letter or object becomes blurred indicates the near point or the closest distance at which the eye can focus clearly. This near point measurement can be used to calculate the power of accommodation.
Text Transcript from Video
Pawel of accommodation
the human eye is able to see objects
with the help of islands
and retina the islands is held by
ciliary muscles normal human eye can see
nearby and far objects clearly power of
accommodation the ability of the islands
to increase or decrease its focal length
to some extent by ciliary muscles is
called power of accommodation working of
islands the islands is made of a fibrous
jelly-like material and hence it is
flexible to see far-off objects clearly
the ciliary muscles relaxed to decrease
curvature of the lens and it becomes
thin and it's focal length increases
thus image of far off objects is made on
retina and the eye is able to see
distant objects to see nearby objects
the ciliary muscles contract to increase
curvature of the lens and it becomes
thick thus focal length of the eye
decreases and it is able to see nearby
objects distinctly like reading
limitation of power of accommodation the
focal length of the eye cannot be
decreased below a specific limit the I
cannot see objects clearly below 25
centimeter so near point of distinct
vision for normal human eye is 25
centimeter however there is no such
limit for distant objects therefore for
point of normal human eye is infinite
you
the human eye is able to see objects
with the help of islands
and retina the islands is held by
ciliary muscles normal human eye can see
nearby and far objects clearly power of
accommodation the ability of the islands
to increase or decrease its focal length
to some extent by ciliary muscles is
called power of accommodation working of
islands the islands is made of a fibrous
jelly-like material and hence it is
flexible to see far-off objects clearly
the ciliary muscles relaxed to decrease
curvature of the lens and it becomes
thin and it's focal length increases
thus image of far off objects is made on
retina and the eye is able to see
distant objects to see nearby objects
the ciliary muscles contract to increase
curvature of the lens and it becomes
thick thus focal length of the eye
decreases and it is able to see nearby
objects distinctly like reading
limitation of power of accommodation the
focal length of the eye cannot be
decreased below a specific limit the I
cannot see objects clearly below 25
centimeter so near point of distinct
vision for normal human eye is 25
centimeter however there is no such
limit for distant objects therefore for
point of normal human eye is infinite
you
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Nov 15, 2024 Last updated |
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