No, to focus ligh, muscles in the eye change the length and thickness of the 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 lens.
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.
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.
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.
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.
Muscles change the shape of the lens in your eye to make sure the image is at its best on the retina
true
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.
focus light onto the retina
the increase in thickness and convexity of the eyes lens in order to focus the image of an external object upon the retina.
In glasses to further the focal length so it is able to be focused at the retina.