Retina Essays

  • Color Matching Experiment Essay

    886 Words  | 4 Pages

    cornea, lens, and pupil, which are located in the front part of the eye. The light then moves to the back of the eye where the retina is located. Contained in the retina are sensory receptors called rods and cones, also known as photoreceptors. When

  • Stop Sign Psychology

    1071 Words  | 5 Pages

    light waves so that the image can be focused on the retina” (Baird 73). The next part of the eye is the iris, which controls the pupil’s size. The pupil changes size depending on the amount of light in the environment based on the iris’ opening. After the light moves through the cornea and pupil, the light travels through the eye to the retina by the lens. The lens will change its shape in order to bring objects into focus for the retina. The retina contains “photoreceptor

  • Essay On Canthoplasty

    1090 Words  | 5 Pages

    CANTHOPLASTY – MAKE THE EYES LOOK BIGGER AND BRIGHTER Canthoplasty is a surgical procedure used to help create an upward slant in the outer corner of the eyelid or correct a drooping appearance in this portion of the eye. Canthoplasty is used to create the much sought after cat eye look with an upwardly slanted outer eyelid corner. It makes drowsy eyes, caused by inner canthus covered with skin or too wide space between the eyes, clearer, bigger and longer. For those who have short length of the

  • Essay On Retina Detachment

    1354 Words  | 6 Pages

    Retinal detachment The retina is a complex layer of tissue that chemically converts light into electronic impulses and sends these impulses to the brain for analysis. It is made of layers of nerves, connecting cells known as neurons, supporting cells, and specialized cells known as rods and cones that do the actual conversion from light to chemicals that stimulate the nerves that transmit the impulse to the brain. Behind the rods and cones is a layer of pigment that absorbs light and helps the rods

  • Occipital Lobe Research Paper

    1553 Words  | 7 Pages

    on the location and severity of the damage. Vision begins with the spatial, temporal, and chromatic components of light falling on the photoreceptors of the retina and ends in the perception of the world around us. The occipital lobe contains the bulk of machinery that enables this process. However, our perception

  • Clinical Macula Case Study

    883 Words  | 4 Pages

    macula. 3. This would be the structural characteristic about midway between the fovea and far periphery, where rods are more numerous than cones and more photoreceptors are converging on bipolar cells. 4. There are three types of cones in our retinas. These three receptors each contain a different pigment. The pigments differ slightly in their chemical properties and subsequently in their relative ability to absorb light of different wavelengths. These cones are loosely called "blue", "green"

  • Retinitis Pigmentosa Case

    804 Words  | 4 Pages

    Retinitis pigmentosa is a rare genetic disorder that causes trouble with seeing at night and reduced peripheral vision. It is a slow, progressive disorder of the eye’s retina. In France, a company developed a gene therapy that may cure the disease. The French company, GenSight Biologics, used a technique called optogenetics. The technique allows scientists to control living cells, in this case, neurons, using light to cure this form of blindness. The optogenetics technique is originally acquired

  • Essay On Ocular Artifacts

    773 Words  | 4 Pages

    the electrodes which placed near or above the ocular region such that, these electrodes are mainly affected with the ocular artifacts. Considering the eye as the dipole which can state as that front part cornea is more positively charged than the retina. This makes the electrode to become more positively charge than the brain potential when the cornea reached near in the eye movement. Vertical, Horizontal eye movement When the eye ball moves vertically i.e., up and down, and side to side then the

  • Essay On Astigmatism

    2081 Words  | 9 Pages

    the retina, not on the retina, because the cornea bends the rays too much or the eye was stretched too long, the eye is myopic, or nearsighted. To bring this eye into focus, the rays must be diverged (actually, less converged) so that the point of focus is on the retina. When the rays meet or focus in front of the retina, they cross and are diverging when they hit the retina. Instead of a point of light on the retina, they cast a blur circle. When the many points of an image become overlapping blur

  • Research Paper On Amblyopia

    1025 Words  | 5 Pages

    Amblyopia is decreased vision in one or both eyes due to abnormal development of vision. The term amblyopia is medically used when the vision in one of the eyes is reduced because the eye and the brain are not working properly together. The eye itself will typically look normal, but it is not being used properly in the visual process. This is due to the brain favoring the healthy eye, and ignoring what comes in from the eye with Amblyopia. This condition is also sometimes called lazy eye. Babies

  • Cataracts Research Paper

    1104 Words  | 5 Pages

    Cataracts is the clouding of the lens of the eye that is generally clear. Generally, for those suffering from cataracts vision is difficult but not completely lost. Many describe living with cataracts as looking through a frosted window and reading, driving, and any details or specifics are difficult to see. There is also cataracts surgery that can effectively improve cataracts for many sufferers. Cataracts is mostly an age related condition. Diabetes and other eye procedures can also lead to the

  • CRVO Case Study Essay

    736 Words  | 3 Pages

    Note that this patient’s right eye has a severe CRVO – dilated veins and widespread retinal hemorrhages. Compared with the patient’s left retina (image on the right) in which there are no retinal hemorrhages Choice “A” is not the best answer. CRAO develops when an embolusi blocks the retinal artery. Most commonly carotid plaques are the source of the emboli. If the plaque is small, it can

  • 5 Major Eye Movements

    781 Words  | 4 Pages

    accomplished with an organ called the eye. The eye receives light and transforms the photon signal into an electrical signal that the brain interprets. This transformation of information is done via the photoreceptor cells found at the back of the eye on the retina. The photoreceptors, rods and cones, are distributed across the back of the eye to capture all light with a higher concentration found in the fovea for fine vision. The light stimulates rods and cones resulting in a change in their membrane potential

  • Anatomic Differences Between Rods And Cones

    784 Words  | 4 Pages

    photoreceptors, or when there is local adaptation of the retina as just after seeing a bright light. 2. Describe the functional and anatomic differences between rods and cones. There are two types of photoreceptors in the human retina, rods and cones. Rods are responsible for vision at low light levels (scotopic vision). They do not mediate color vision, and have a low spatial acuity. There are two types of photoreceptors in the human retina, rods and cones. Rods are responsible for

  • Retinitis Pigmentosa Case Study

    1471 Words  | 6 Pages

    retinitis pigmentosa. Keywords: Retinitis Pigmentosa INTRODUCTION Retinitis pigmentosa (RP) is an inherited, degenerative eye disease that causes severe vision impairment due to the progressive degeneration of the rod photoreceptor cells in the retina. It may be inherited as autosomal dominant (seen often), recessive or X-linked. It must be noted that RP can also occur as an isolated sporadic disorder and it is associated with myopia. This disease has no preference for age, it can occur to anyone

  • Genetic Disorders: Color Blindness

    594 Words  | 3 Pages

    Our eyesight and capability to tell colors apart is caused by three cones in the retina of an eye. The three cones are red, green, and blue, and if any of the cones has a deficiency then that is what causes color blindness. From the "Color Blindness" article it says, "There are three basic variants of color blindness. Red/green color

  • Essay On Blindsight

    833 Words  | 4 Pages

    4. Definition Blindsight is the phenomenon where individuals who are completely blind in some or all of their visual fields (the total area where objects can be seen as one’s eyes are fixed on a single point in space) are capable of detecting, localizing, or identifying a visual stimulus located in their affected visual fields despite denying that they see the stimulus (Cowey 2004). As the oxymoronic term suggests, blindsight has two components. When presented with a visual stimulus, patients report

  • Nursing Reflection: The Gibbs Cycle In Nursing

    2199 Words  | 9 Pages

    INTRODUCTION Reflection is a holistic experience that allows the person participating, to evaluate the event both after and during the course of the incident (Johns 2006). Reflection facilitates the understanding and determining of the contraindications that may have occurred throughout the practice from what is required (Johns 2006). There are many models to aid in the process of reflection (Boud et al 1995, Boyd and Fales 1983, Mezirow 1981 cited in Johns 2006). I have chosen the Gibbs cycle (1988)

  • The Future Of Photography Essay

    950 Words  | 4 Pages

    hotography is an image full of signifiers. We all see and perceive photographs in the same way. Our visual system is the eye, which takes in the physical stimuli of light rays which converts them into electrical and chemical signals that can be interpreted by the brain to construct physical images. Therefore we still understand that the photograph is a representation of reality. Photography has changed since it first was introduced around the year 1800, Thomas Wedgwood created the process on how

  • Essay On Squint

    1051 Words  | 5 Pages

    Squint & Paediatric Ophthalmology Paediatric eye surgeries are used to treat a variety of eye problems. Squint (also known as strabismus) is a condition that arises because of an incorrect balance of the muscles that move the eye or faulty nerve signals to the eye muscles and focusing faults. If these are out of balance, the eye may converge (turn towards the inside), diverge (turn towards the outside) or sometimes turn up or down, preventing the eyes from working functioning together. Squint can