Which of the following is the function of the retina?
The retina is a thin layer of tissue that lines the back of the eye on the inside. It is located near the optic nerve. The purpose of the retina is to receive light that the lens has focused, convert the light into neural signals, and send these signals on to the brain for visual recognition.
What does the retina consist of?
The retina consists of millions of cells packed together in a tightly knit network spread over the surface of the back of the eye. These cells can be divided into a three basic cell types, photoreceptor cells, neuronal cells, and glial cells. Photoreceptor cells consist principally of cones and rods.
What is the function of the retina quizlet?
What is the function of the retina? The retina receives light focused from the lens, converts the light into neural signals, and sends these signals on to the brain.
What is retinal quizlet?
Retina. Light sensitive surface at the back of the eye consisting of neurons (ganglion and bipolar cells) and photoreceptors.
Is retinal vitamin A?
Retinol, also known as vitamin A1-alcohol, is a vitamin in the vitamin A family found in food and used as a dietary supplement. As a supplement it is ingested to treat and prevent vitamin A deficiency, especially that which results in xerophthalmia.
What is the retina made of quizlet?
A small area in the center of the retina, composed entirely of cones, where visual information is most sharply focused. Photoreceptor cells concentrated around the edges of the retina that provide black-and-white vision in dim light and enables us to see at night.
Which type of cone is least common in the retina?
Cone cells are densely packed in the fovea centralis, a 0.3 mm diameter rod-free area with very thin, densely packed cones which quickly reduce in number towards the periphery of the retina. Conversely, they are absent from the optic disc, contributing to the blind spot.
Where is the highest density of rods?
The highest rod densities are located along an elliptical ring at the eccentricity of the optic disk (c. 4 min or 20 deg from the foveal centre) and extending into nasal retina.
Where are the cones concentrated in the retina quizlet?
More rods than cones. Cones are concentrated at the fovea (middle of the eye). Rods are concentrated at the periphery of the retina.
What is the function of the cone shaped photoreceptor cell of the eye quizlet?
Cone cells, or cones, are one of the two types of photoreceptor cells that are in the retina of the eye which are responsible for color vision; they function best in relatively bright light, as opposed to rod cells that work better in dim light.
Where are cones located in the eye?
They are concentrated in the small central part of the retina known as the fovea centralis, measuring 0.3 millimetres across and devoid of rods. There are three types of cones: – Red cones, accounting for 64% of the total, also known as L-cones (maximally sensitive to long-wave light).
Which region of the retina has the best visual acuity?
What is another name for the center of the retina?
In the middle of the retina is a small dimple called the fovea or fovea centralis. It is the center of the eye’s sharpest vision and the location of most color perception. “A thin layer (about 0.5 to 0.1mm thick) of light receptor cells covers the inner surface of the choroid.
Which cells in the eye are responsible for color vision?
Cone cells, or cones, are one of the two types of photoreceptor cells that are in the retina of the eye which are responsible for color vision as well as eye color sensitivity; they function best in relatively bright light, as opposed to rod cells that work better in dim light.
How can you tell if your retina is damaged?
Symptoms of a damaged retina are dim vision, blurring of vision, flashes of light, and more. The retina is the innermost layer in the back of the eye and is the portion of the eye that receives light.
How does retina get damaged?
Common retinal diseases and conditions include: Retinal tear. A retinal tear occurs when the clear, gel-like substance in the center of your eye (vitreous) shrinks and tugs on the thin layer of tissue lining the back of your eye (retina) with enough traction to cause a break in the tissue.
Why does the retina become weak?
Retinal detachment facts Most retinal detachments are a result of a retinal break, hole, or tear. Most retinal breaks, holes, or tears are not caused by trauma (injury) but are due to preexisting factors such as high levels of myopia (nearsightedness), prior ocular surgery, and other eye diseases.