What 's The Retina Because Of Two Reasons

After being shown a picture of an elephant they eye will take the light that is reflected from the object and it will enter the eye through the pupil. Then the light will be focused by the cornea and the lens to form a sharp image of the elephant in the retina. The retina is the network of neurons that cover the back of the eye and contains the visual receptors for a person vision. The visual receptors are made up of cones and rods that contain light sensitive chemicals called visual pigments. Visual pigments reacht to light and cause a triggered electrical signals to occur. These electrical signals will then flow through a network of neurons and this network of neurons is what makes up a persons retina. After the flow through the network of neurons occurs the electrical signals will emerge from the back of the eye in the area

Focusing an image clearly onto the retina is the initial step in the process of vision, but although a sharp image on the retina is essential for clear vision, a person does not see the picture on the retina. Vision occurs not in the retina, but in the brain. Before the brain can create vision, the light on the retina must activate the visual receptors in the retina by a two-element

Also, on the retina is the optic disk. There are no photoreceptors in this area, so any light that falls on this part of the retina is unseen and creates what is called the blind spot. (Hugh

In the world of neurology, there are a vast amount of neurological disorders, conditions, and diseases. One severe disease is known as Multiple Sclerosis. In this research essay, I will be discussing what multiple sclerosis is, symptoms, causes, personal experience, and treatments.

Specific Purpose: To inform my audience about multiple sclerosis by exploring various facts of the disease including what causes it, types of the disease and how it is treated.

The retina is what houses the eye’s rods and cones. The eye has about 6 million cones and 120 million rods. Both rods and cones get their names from their shape. Rods do not provide color vision, and are sensitive to dim light. Cones function well in the day and provide color vision.

What drew me to the field of optometry specifically is the fact that our eyes can be considered one of our most precious gifts. Growing up my siblings always needed some sort of corrective lenses, leaving me in the dark so to speak. When I was younger I suffered a corneal

The debilitating disease affecting 20-45 year olds around the world: Multiple Sclerosis (MS). This unpredictable disease makes it somewhat challenging for doctors to diagnose it, as it can mock other diseases. Symptoms are variable and come in different degrees of severity. No two people have the exact same symptoms. There are four main categories of MS, with different treatment options. If controlled, MS will only have a few limitations and is, for the most part, ease to adapt to.

The idea that a singular organ could advance human beings to the pinnacle of the animal kingdom is mind blowing. Furthermore, the more I learn about the anatomy of the eye, the more I appreciate how sophisticated our sense of vision truly is. In addition to being fascinated by the eye, I am also highly fascinated with how biology works; especially on the microscopic scale. Biochemical molecules and the workings of the fundamental units of our universe intrigue me since they are functioning in and around you as you are learning about them. I believe my fascination with the fundamental units of our universe, coupled with my fascination of the eye will allow me to do very well in the vision and biomedical courses that optometry school focuses

Imagine a world where you have been diagnosed with a disease that has no cure and left your world upside down because your body has turned against you. Multiple Sclerosis is a potentially debilitating disease that is caused by the body’s immune system attacking the Myelin sheath of nerve fibers throughout the body (Multiple Sclerosis, 2017). This, in turn, creates miscommunication or lack of communication in the body, which can eventually lead to permanent disability. For those who are diagnosed, there are various symptoms to watch for and while not curable, it is treatable.

My world flipped upside down as the doctor told me I had Amyotrophic lateral sclerosis and that it was progressing fast. The fact that I didn’t even know what that long medical word meant scared me even more. I instantly turned to the window and stared at the busy highway, tears started rushing down my face like raindrops, unwelcome and unstoppable.

The eyeball holds many parts to allow eyesight. The retina holds the key to allowing the human eye to see color. The pupil appears as the black part of the eye that people see, the pupil however does not have much to do with comprehending color. As Clarence Rainwater said in his book “The pupil is simply the hole in the iris through which light enters the eye.” (84) The light then has to pass through many parts of the eye before reaching the retina such as the transparent cornea, the aqueous humor, the lens, and the vitreous humor. Clarence Rainwater described the retina as “... the eye’s sensitive inner surface.” (86) The exciting part of the eye starts here. The retina holds the key as stated by Clarence Rainwater, “... a complex system

The eyelids are made up of four layers, the skin, muscle, connective tissue and conjunctiva. The process of vision occurs when light waves from an object, enter through the iris. Light then passes through the lens of the eye, a double convex structure that is used to focus the light, and then reaches the retina. Inside the retina are rods and cones. Rods are used to sense light and dark, and cones are used for sensing colors. Whether the light entering the eye hits the cones or rods, a signal is sent across the optic nerve to the brain where it is processed and viewed as an image. Some issues people have with eyesight are as follows. Those who are farsighted are unable to see things clearly at a short distance, compared to a long distance. This occurs when the light that enters the eye is focused behind the retina, and not directly onto it. When the cornea is not curved enough, this happens. Nearsightedness is when one can see objects clear at a short distance, but not at a longer distance, and this is often caused by a change in the cornea. A Blind spot is the location the optic disk, where the optic nerve fiber exits, and at this location there are no cones or rods, so there is a blind spot.

I looked into the physics of the eye itself and into corrective lenses because I wear glasses. The human eye is a very complex piece of anatomy. Like a camera, the eye is able to refract light and produce an image that can enable someone to see.