Retina

Scattered light from an object goes through the lens of the eye, which focuses the light and forms an image on the back surface of the eye, called the retina. The retina then sends signals of the image to the brain. How does a lens focus light? The light passing through a convex lens, which is thick at the center and thin at the edge, always bends light rays together so that they come together at a focal point…

First and foremost, the doctor will use a special instrument to examine the back of your eye byputting drops in your eyes to dilate them. He or she will look for a mottled appearance consistsyellow deposits that caused by drusenthat form under the retina. People with macular degeneration often have many drusen which are made up of lipids, a fatty protein. Drusen likely do not cause age-related macular degeneration, but having drusen increases a person’s risk of developing it. Then, during an eye…

BMS2048 Neuroscience – Practical 2 The Structure of the Mouse Retina Introduction Retinitis Pigmentosa (RP) is a genetic disorder that results in the degradation of photoreceptors in the retina. This leads to difficulties with night vision, reduced peripheral vision and eventually the complete loss of visual activity. It’s inherited as an autosomal dominant, autosomal recessive, as well as an X-linked trait. A small percentage of people with this disorder have a mutation in the gene that codes…

What is the Bionic Eye and how are Australians involved? A bionic eye mimics the function of the retina to restore sight for those with severe vision loss. It’s proudly pioneered by Australia, giving Aussies a great name to Science. Researches from the Bionic Ear Institute, University of Melbourne and the University of New South Wales are in the development of a better bionic eye, which incorporates easier lifestyle. The inventor of the bionic eye Mark Humayun invented the first prototype of the…

through the lens to the retina. The lens must be clear for the retina to acquire a sharp image. If the lens is cloudy the retina will receive a blurry image resulting in distorted vision. Cataracts are degenerative to the eye as you increase in age. Many people live not knowing they have it unless checked…

cholesterol. Proliferative retinopathy can also be treated with laser surgery using a particular type of surgery called scatter laser treatment. This treatment helps to shrink the abnormal blood vessels by placing the laser burns in the area of the retina away from the macular. This causes the abnormal blood vessels to shrink thus reducing the chances of abnormal blood vessels bleeding. Although you may still notice some peripheral vision loss, you’ll most definitely save the rest of your…

diameters was developed and a magnet is used in order to adjust pupil diameter, on simulation by high and low intensities of light.8In 1991, Silicon chip with photodiodes as receptor was perfected, which could be invasively implanted between the layers of retina to enhance the sight.1 Autonomous motor system was shaped to detect the movement of the eye i.e. replace the eye by mechanical eye with the help of array of sensors, there by mimicking…

In the early stages of retinopathy, the capillaries of the retina become more permeable. This can cause fluid exudation (hard exudates) into the retina, these appear as small well defined yellowish white patches. Micro aneurysms can develop, which can rupture causing small bleeds. Arterial occlusions due to poor oxygenation of the nerve fibres by the retinal capillaries (Morrison) cause retinal infarcts ‘cotton wool spots’ on the retina. Thickening of the basement membranes of the retinal…

262 (Summary: Usher Syndrome, Type 1G). USH1G gene’s main function is to provide information for making a protein, SANS, which is located in the inner ear and the retina. The protein SANS, interacts with other proteins which forms a larger protein complex which is critical for the development and function of the inner ear and retina. In the inner ear, SANS promotes the maintenance and development of the hair bundles and the tufts of the hair-like projections on cells lining in the inner ear.…

light rays pass through the cornea and pupil and hit the lens that creates an image on the retina. The retina then sends the image to the optic nerve that makes you able to see. The eye can work like this because it has its own lens that is able to focus on an image that is given to the retina. Since your pupils grow and shrink, depending on how much light is present, the image that is given to the retina may be larger, smaller, or the same size as the object (Roberts). Third, the eye works in…