The vitreous humor helps to keep the retina firmly in place, according to WebRN-MacularDegeneration.com. Additionally, the vitreous humor fills much of the eye, allowing light to pass through the lens to the retina and helping the eye to keep its round shape. The space the vitreous humor fills is called the vitreous body.
Healthline explains that vitreous humor is composed primarily of water, but other substances, such as salts, sugars and collagen, are also constituents of the gel. As it is necessary for light to penetrate the substance, it must remain very clear. The vitreous humor is a static collection of fluid. This means that it is not replenished or replaced by the human body. By contrast, the aqueous humor, which resides near the front of the eye, is routinely replaced. This means that if some substance enters the vitreous humor, usually blood, fibers or blood vessels, it remains there until removed surgically.
According to WebRN-MacularDegeneration.com, the vitreous humor can become less gel-like and more liquefied as people age. This liquefaction can cause fibers from the retina to detach and float freely through the vitreous humor. These free-floating fibers sometimes become noticeable in people's field of vision, appearing as dust, strings, dots or cobwebs, and physicians call them floaters.Learn More
The fovea centralis is a depression-like area located at the centermost part of the retina of the eye. Only cone cells are located in the fovea centralis, and each cone cell is attached to a ganglion cell. This dip or depression in the smallest part of the retina is the location in which the most acute vision takes place.Full Answer >
The two main functions of the lens of the eye are to focus light onto the retina and to help the eye focus on objects at various distances. The lens of the eye is a rubbery, jellylike structure. It is located behind the cornea and is held in place by tendons that are attached to a set of muscles called ciliary muscles.Full Answer >
Rods and cones function as photoreceptors in the retina of the eye, turning visible light into neuronal signals, which are sent to the brain. This process is called transduction. Rods and cones perform at different wavelengths and sensitivities allowing detailed perception of light and color.Full Answer >
According to the University of Michigan Kellogg Eye Center, the function of the iris in the eye is to control the amount of light that reaches the retina. It does this by changing the size of the pupil, the transparent window that allows light into the eye's interior.Full Answer >