Focusing on Near and Far Objects

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Questions and Answers

How does the eye adjust to focus on a near object compared to a far object?

The ciliary muscles relax, the zonule fibers relax, and the lens becomes thinner.
The ciliary muscles contract, the zonule fibers relax, and the lens becomes rounded. (correct)
The ciliary muscles contract, the zonule fibers relax, and the lens becomes thinner.
The ciliary muscles relax, the zonule fibers become taut, and the lens becomes rounded.

What is the state of the eye lens when focusing on far objects?

Thicker and more powerful due to contracted eye muscles.
Its shape is not influenced by the distance of the viewed object.
Rounded due to the relaxed state of the zonule fibers.
Flattened and less powerful due to taut zonule fibers. (correct)

If an individual is having difficulty seeing distant objects clearly, which of the following describes the likely adjustment their eye is unable to make effectively?

The ciliary muscles are unable to contract sufficiently.
The eye lens is becoming thicker than normal
The eye lens is unable to flatten adequately. (correct)
The zonule fibers are unable to relax adequately.

How does the image formed on the retina relate to the actual orientation of the object being viewed?

<p>The image is inverted and reversed. (D)</p> Signup and view all the answers

Imagine a scenario where the zonule fibers of the eye are permanently damaged and unable to change tension. What would be the most likely consequence?

<p>The eye would be unable to adjust focus between near and distant objects. (D)</p> Signup and view all the answers

Flashcards

Image Orientation on Retina

The image formed on the retina is upside down.

Focusing on Near Objects

When viewing near objects, the ciliary muscle contracts, the zonule fibers relax, and the lens becomes more rounded to increase its refractive power.

Focusing on Far Objects

When viewing distant objects, the ciliary muscle relaxes, the zonule fibers become taut, and the lens flattens to decrease refractive power.

Eye Muscles for Close Objects

For close objects, the eye muscles shorten, making the eye lens thicker and more powerful.

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Eye Muscles for Distant Objects

For far objects, the eye muscles lengthen, allowing the eye lens to become thin and less powerful.

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Study Notes

The eye forms an inverted image on the retina.

Focusing on Near Objects

Light rays from close objects diverge.
To focus on near objects, eye muscles contract, making the lens thicker and more powerful.
The ciliary muscle is contracted.
The zonule fibers are relaxed.
The lens becomes rounded.

Focusing on Far Objects

Light rays from distant objects are nearly parallel.
To focus on distant objects, eye muscles relax, causing the lens to become thin and less powerful.
The ciliary muscle is relaxed.
The zonule fibers are taut.
The lens is flattened.

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Description

The eye focuses light on the retina by adjusting the lens. For near objects, the lens becomes thicker. For far objects, the lens flattens to focus the light.