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Human Eye - Power of Accommodation of Human Eye - (Chapter 13): CBSE Class 10 Science
The human eye, the structure of the human eye, the working of the human eye, the importance of the human eye, etc, topics are described in this video of Class 10 Science.

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Human Eye - Power of Accommodation of Human Eye - (Chapter 13): CBSE Class 10 Science

Here we describe the topic as, the power of accommodation of human eye form chapter The Human Eye and The Colorful World of CBSE class 10 science.

Power of accommodation of human eye:

In simple words, we can say as,
The ability of the eye to focus objects lying at different distances is called the power of accommodation of the eye.

We can also define it process as,
The process by which the ciliary muscles change the focal length of an eye lens to focus distant or near objects clearly on the retina is called the accommodation of the eye.

It primarily involves the lens and ciliary muscles.
The ciliary muscles are capable of modifying the curvature of the lens and thereby affecting the focal length of the lens.

When viewing objects which are nearby, the ciliary muscles contract, the lens becomes thicker. It is squeezed into a more convex shape and the focal length decreases (curvature increases). The images again fall on the retina.

Note that here the eye is 'accommodating' by taking a thicker shape so that the image falls on the retina.

When viewing objects which are far away, the ciliary muscles expand, the lens becomes thinner. It is relaxed/loosened into a less convex shape and the focal length increases (curvature decreases). The images again fall on the retina.

Note that here the eye is 'accommodating' by taking a thinner shape so that the image falls on the retina.

However, the focal length of the eye cannot be reduced below a certain minimum limit. If you read a book very close to your eye, it will appear blurred.

The minimum distance, at which objects can be seen most distinctly without strain is called the 'Least Distance of Distinct Vision' or the 'Near point of the eye'.

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