Retina

through the pupil and there, the iris determines how much or how little light is necessary in order to see the image properly. The cornea and lens will adjust the length of the image being seen from the back of the eye. Visual reception occurs at the retina where photoreceptor cells, cones and rods, give the image color and shadow. The image is converted into neural impulses. These impulses must be converted into a chemical signal in order to travel through a synaptic gap and finally, transfer…

Color Blindness is defined as the inability or decreased ability to see color, or perceive color differences, under normal lighting conditions. Color blindness is also referred to as color vision deficiency. In the United States alone there are about three million cases noted per year for color blindness. This disorder seems to affect men more than it does women. It is estimated that around eight percent of males and a little less than one percent of females are diagnosed in the United…

Pucker A macular pucker is scarring on the macula of your eye. The macula is the part of the eye that lets you see clearly and sharply. It also lets you see detail. The macula is in the middle of the thin membrane that covers the back of your eye (retina). A macular pucker can affect your vision. This condition usually starts in one eye, but can affect both eyes over time. Vision changes can range from mild to severe. Vision changes usually do not get worse over time. CAUSES This condition…

Diabetic Retinopathy causes complete vison loss, blurred visions, and the blood vessels in the retina become damaged. The regulation of diabetes and previous health conditions are very crucial in the step being taken to prevent retinopathy, nephropathy, macro-vascular, and neuropathy which are life threatening conditions that run alongside with unmanaged…

had. As time elapsed, transparent cells covered the pinhole to prevent infection allowing the inside to fill with fluid which optimized light sensitivity. Crystalline proteins then developed which allowed focusing light into a single point on the retina, this was the beginning of the lens. The lens thanks to ciliary muscles allowed for the accommodation of distances so that the image would be sharp whether the distance was near or far. Other additions were made such as the sclera to maintain…

Usher Syndrome Usher syndrome is a condition that causes hearing loss and vision loss. There are three types of Usher syndrome: Type 1. Children with this type have severe hearing loss and balance problems at birth. Vision problems usually develop before age 10, and vision loss quickly progress to total blindness. Type 2. Children with this type have moderate to severe hearing loss at birth. They do not have balance problems. Vision problems usually develop during the teenage years.…

Opening: Zinc- an essential nutrient, called “ Helper molecule”. It takes a vital role in supplying vitamin A from the liver to the retina to produce melamine_ a protective pigment in the eyes. Zinc is concentrated in the eye almost in the retina and choroid, the vascular tissue under the retina. A person who have too little zinc in their body will be at risk for alopecia and increased susceptibility to infection. Body: Benefits of zinc with your eye Do you have high contents of the mineral…

Further tests will then be performed such as a visual field test, examination of the optic disk, electroretinogram (ERG) to measure the electrical response of the retina and numerous other tests to confirm or rule out other possible causes.(About LHON.) At this time due to the rarity of the disease there is no cure or one hundred percent efficient treatment for Leber’s hereditary optic neuropathy. However it is believed…

Macular degeneration, retinitis pigmentosa, and Stargardt’s Disease are genetic disorders that lead to the loss or deterioration of retina cells, which leads to the loss of vision, generally. In the United States, over 11 million people suffer from these conditions, but there is help. How We Treat Macular Degeneration, Retinitis Pigmentosa, and Stargardt’s Disease Since 1983, treatments for macular degeneration and other retinal conditions have existed, such as the use of microcurrent…

membrane called the retina. The retina contains a vast amount of these specialized cells but there is one location where only cones exist and they are sited in the fovea which is in the middle portion of the retina. (Lilienfeld et al., 2014) Lastly, scenario B fails to define the function of the photoreceptor cells correctly by proposing that rods are responsible for colored vision while cones are responsible for night vision. Rods are the most abundant photoreceptor cells in the retina and…