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No, to focus ligh, muscles in the eye change the length and thickness of the lens.

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Q: Is it true that to focus light muscles in the eye change the length and thickness of the retina?
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Why is it important for your eye to contain a lens?

Without the lens in your eye you can not form a image on the retina. As the retina is kept at a fixed distance you change the thickness of the lens to get the image on the retina.


Objects are brought into focus on the retina by changes in the curve and thickness of the?

Objects are brought into focus on the retina by changes in the curve and thickness of the lens.


What controls the thickness of the lens to help focus light on the retina?

It is detected by the retina and 'thickness' varies as it is a reflex action; it cannot be controlled. Basically, 'you' cause it without knowing so.


Eye has fixed focal lengthThen how can you say that the focal length of changes?

The eye has variable focal length, its lense varies with thickness in order to focus to distant or nearby objects. Focal distance is constant, from lense to retina.


What happens to the image distance in the eye when you increase the distance of an object from the eye?

If everything is working as it should, the image distance in the eye never changes. The image always needs to focus on the retina, which doesn't move. This is where the lens comes in, specifically its ability to change its focal length. When the object distance changes, the focal length has to change, in order to keep the image distance constant. Muscles around the lens change the shape of the lens, in order to change its focal length.


What happens if the lens does not focus properly on the retina?

The muscles around the eye lens attempt to change its focal length (done subconsciously). Sometimes, often due to age, this is not adequate and people resort to wearing glasses to adapt the neutral focus position of the eye.


What happens to a persons eye when they look up close at something?

Muscles change the shape of the lens in your eye to make sure the image is at its best on the retina


Does light pass through the entire thickness of the neural layer of the retina to excite the photoreceptors?

true


What does the lens do on an eye?

It makes an image to fall on the retina. For this function the thickness of the lens is changed according to the distance of the object.


If a person with an injury to the extrinsic muscles of the eye would find it difficult to what?

focus light onto the retina


What part of the eye are made of cells?

the increase in thickness and convexity of the eyes lens in order to focus the image of an external object upon the retina.


How can a concave lens be used?

In glasses to further the focal length so it is able to be focused at the retina.