Examlex
As light passes through the eye it is focused by the __________, which always focuses light in the same way, and the __________, which is flexible and enables focusing on objects at different distances by varying its thickness.
Lens
An optical device made of transparent material that affects the focusing of light rays to form images.
Rods
Light-sensing nerve cells in the eye, at the posterior of the retina, that function in dim light but do not provide sharp images or detect color.
Cones
Light-sensing nerve cells in the eye, at the posterior of the retina, that are sensitive to color, provide sharp images, and function only in bright light.
Retinas
The light-sensitive layer of tissue at the back of the inner eye, essential for converting light into neural signals for vision.
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