from Rods and cones
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* '''Ciliary muscle''' is a ring of muscle fibers in the eye that control the tendons supporting the natural [[lens]] of the eye, and controls the flow of [[aqueous humor]] behind the [[cornea]]. The Ciliary muscle is controlled by the Ciliary ganglion, which is a complex intersection of several nerve systems. The action of the ciliary muscle is the primary source of [[accommodation]] and [[ciliary spasm]] which causes [[pseudomyopia]]. | * '''Ciliary muscle''' is a ring of muscle fibers in the eye that control the tendons supporting the natural [[lens]] of the eye, and controls the flow of [[aqueous humor]] behind the [[cornea]]. The Ciliary muscle is controlled by the Ciliary ganglion, which is a complex intersection of several nerve systems. The action of the ciliary muscle is the primary source of [[accommodation]] and [[ciliary spasm]] which causes [[pseudomyopia]]. | ||
* '''Lens''' - The part that changes the focus distance of the eye | * '''Lens''' - The part that changes the focus distance of the eye | ||
* '''Rods and cones''' - the sensory cells of the eye that | * '''Rods and cones''' - Rods and Cones are the sensory cells in the back of your eye that detect light. | ||
** Rods sense only light intensity, not color. They sense edges more sharply than cones. If you are outside at dusk, you may feel a sudden switch of your vision from color vision to black and white, this is your [[visual cortex]] switching to only rod input when cone input isn't working as well in dim light. | |||
** Cones are the cells that detect color in your eye. There are three different types of cones that respond most strongly to three different wavelengths of light. Your visual cortex takes the combined response of the three types of cones and makes up the blended color in your mind. Magenta for example is an imaginary color. It's the color your brain makes up to explain why both short and long wavelengths of light are detected, but not the wavelengths in the middle. Most colors are on the color spectrum you learned in school (Red, Orange, Yellow, Green, Blue, Indigo, Violet), and will trigger a single cone type, or two adjacent cone types. | |||
* '''Retina''' - the tissue that supports the rods and cones. | * '''Retina''' - the tissue that supports the rods and cones. | ||
* '''Vitreous humor''' is the clear gel filling the majority of the eyeball. It is where true [[floaters]] live. This gel is important for helping the eye hold its shape and maintain the correct pressures inside the eye even when air pressure changes. In adults, the gel has a complex structure, with different thicknesses in different parts. | * '''Vitreous humor''' is the clear gel filling the majority of the eyeball. It is where true [[floaters]] live. This gel is important for helping the eye hold its shape and maintain the correct pressures inside the eye even when air pressure changes. In adults, the gel has a complex structure, with different thicknesses in different parts. | ||
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= Axial Length = | = Axial Length = | ||
The primary cause of differences in [[refractive state]] is the length of the eye, referred to as axial length, relative to the focusing power. Long eyeballs are associated with myopia, as the natural lens of the eye focuses light too far forward of the retina. | The primary cause of differences in [[refractive state]] is the length of the eye, referred to as axial length, relative to the focusing power. Long eyeballs are associated with myopia, as the natural lens of the eye focuses light too far forward of the retina. | ||
=See Also= | |||
* [[Duochrome Test]] | |||
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||