Photoreceptor cell

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  • Essay On Visual Prosthetics

    prosthetic focuses on correcting one part of the visual mechanism so that the entire mechanism can function as a whole. Visual prosthetics fall under two different categories. The first category includes prosthetics that are implanted in the eye. These usually require less invasive surgery for installation than optic nerve implants because surgery involves only the eye and does not require tampering with the skull around the eye (Pezaris et al, 2009). Research on in-eye prosthetics mainly focuses on developing a retinal prosthetic. A positive aspect to developing a retinal prosthetic is that it can restore the entire field of vision. Most retinal prosthetics are comprised of a collection of electrodes that function in the same way that a photoreceptor cell in the retina would (Pezaris et al, 2009). The electrode fit on to a small surface and do not require surgical attachment to the eye, they are just imbedded in the retina. Light stimulates the implant, which in turn releases an electrical impulse to the surrounding nerve endings, which are then collected and transmitted to the brain to create an…

    Words: 2169 - Pages: 9
  • Visual Communication: How Our Eyes Take In Visual Perception

    children carry them. No longer are they just devices used to make a call; they are an extension of our selves. These media devices are pocket-sized computers that allow for multiple connections and interactions to be happening concurrently. This is a remarkable tool. It can also be a deadly tool. “We shape our tools and afterwards our tools shape us,” (Marshall McLuhan, n.d.). The fault is not in the device, but the user that makes it dangerous. A stunning video, done by Volkswagen (2014),…

    Words: 2059 - Pages: 8
  • Five Senses Research Paper

    light then passes through the pupil, a small opening in the center of the eye. Surrounding the pupil is the iris. This is the colored part of your eye that is responsible for regulating the light intensity that comes in contact with the pupil by constricting or dilating. For example, if you walk outside on a sunny day from a dark room you might find yourself squinting for a few seconds until your iris dilates adjusting to the greater amount of light. The lens is a structure located behind the…

    Words: 783 - Pages: 4
  • Sphere Luttetia Soto Analysis

    The work of art I chose -- “Sphere Lutétia” is created by Jesús Rafael Soto. He was a Venezuelan op and kinetic artist who born in 1923 and passed away in 2005, at the age of 81. Most of his artworks have shown the connection to space. This particular artistic form developed by Soto is broadly known as the “Penetrable”. The “Sphere Lutétia” that created in 1996 is regarded as a representative one. It has been exhibited in "Les Champs de la sculpture” in Paris and Miami Art Basel in 1996. And it…

    Words: 985 - Pages: 4
  • Pebbles Around A Hole Analysis

    The artwork I choose is Pebbles around a Hole. The artist is Andy Goldsworthy. He was born in Britain in 1956. He created Pebbles around a Hole in 1987. The medium used is chromogenic print. The size is 65.5 x 67 cm. The location is unknown. The subject matter is an eye. The black hole is the pupil and the colored rings around it are the colored parts of the eye. I see it as an eye looking at us while we do not know what could possibly be looking back at us. The eye could also be looking deep…

    Words: 808 - Pages: 4
  • Case Study: Know Your Body Eye '

    It is the main factor causing irreversible blindness in the old aged people. Macular degeneration may be limited to one or both of the eyes. The main cause of loss of vision is decrease in function of rods and cones (these cells are responsible for vision) with passage of age. Signs and symptoms: The main complaint of macular degeneration is loss of central vision but the patient never becomes completely blind. The initial complaint is blurred vision; straight objects appear to be bent.…

    Words: 1325 - Pages: 6
  • Reflection Essay: What Is The Refractive Error?

    Assignment 228 . What is the refractive error? Normally, the rays of light entering the eye are brought to a precise focus on the retina, the light sensitive layer lining the back of the eye. When such a focus is not achieved, a refractive error results and vision is not clear. These defects in the focusing power of the eye are called refractive errors, most common symptoms of refractive error is blurry vision. Ophthalmologist can serve the patient by asking questions and obtain information,…

    Words: 1286 - Pages: 6
  • How The Eye Works

    The first area of the brain to receive input from ganglion cells is the lateral geniculate nucleus of the thalamus. From there the thalamus sends information to the primary visual cortex in the occipital lobe and area V1 sends information back to the thalamus. These two areas feed information back and forth. Area V1 also sends information to the secondary visual cortex (V1) which then relays that information to different areas of the brain. The ventral stream runs along the occipital cortex to…

    Words: 1794 - Pages: 8
  • Adelbert Ames Room Research Paper

    An Ames room is a distorted room that gives an optical illusion. The room was first constructed in 1946 by an American ophthalmologist named Adelbert Ames Jr. and it was invented in 1934. The room is based on a concept invented by Hermann Helmholtz in the late 19th century according to my research. The room has two illusions, one is that the room appears to look squared when you look at it through a small hole in the front of the room but it is not it is actually like a trapezoid. The second…

    Words: 645 - Pages: 3
  • Structure Of Eye Essay

    When the information leaves the optic nerve it goes to the visual cortex located at the back of the brain as well. The visual cortex mainly processes visual information. The fovea is by far the most important part of the retina. It is an itty bitty tiny area in the center of the retina which deals with vision. The fovea contains cones which is very vital to many visual tasks. There are two theories that have to deal with color vison. These two theories include: Trichromatic theory and they…

    Words: 565 - Pages: 3
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