Power Of Accommodation Of The Eye - Definition, Importance, Video ...

Accommodation of the Eye

The process by which certain muscles (called ciliary muscles) function to change the focal length of the eyes so that the image is clearly formed on the retina is called accommodation of the eye. This will vary for near and distant objects and also for objects moving away or towards the eye. By adjusting the focal length, the eye is actually changing its lens power as well, isn’t it? This is called the accommodating power of the eye. Literally. The eye’s power to change its power.

You can actually put this power of your eye to the test. Keep your finger in front of you and try to focus only on the finger. You will notice that objects in the background tend to get blurry. Now do the opposite. Keep your finger in front of your face but focus on something in the background. What happens now? Your finger is blurred.

So how does this accommodating power work considering the varying distances?

If the object in consideration is at a distance, for the image to form at the retina, the focal length has to be large. Here, the ciliary muscles relax, thereby thinning the eye lens. The focal length increases and the image is formed perfectly on the retina. Similarly, in the case of near-lying objects, the ciliary muscles contract and thereby thickening the lens. This causes a reduction in the focal length for ideal image formation.

Read More: Structure of Human Eye

Did You Know?

1. The Power of accommodation for a person with normal eyesight is around 4 dioptre (unit of lens power).
2. The power of accommodation of the eye is limited. The focal length cannot be altered after a certain limit.

To know various defects of the eye and their correction, see the video below

Frequently Asked Questions – FAQs

Q1

What is meant by accommodation of the eye?

The process by which certain muscles known as ciliary muscles function, to change the focal length of the eyes so that the image is clearly formed on the retina is called the accommodation of the eye. Q2

State true or false: When the focal length changes, the eye also changes its lens power.

TRUE. Q3

What is myopia also known as?

Myopia is also known as near-sightedness or short-sightedness. Q4

What is the power of accommodation for a person with normal eyesight?

The power of accommodation for a person with normal eyesight is around 4 dioptre. Q5

Name some common defects of the human eye?

Common defects of the human eye are:

• Myopia or near-sightedness
• Hypermetropia or far-sightedness
• Presbyopia

Watch the video and solve previous year questions in the chapter The Human Eye and Colorful World Class 10

Know about various defects of the eye and ways to correct them. Learn all about the accommodating power of the eye with our expert faculty only at BYJU’S.

Test Your Knowledge On Power Of Accommodation The Eye! Q5

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