"Retina" Essays and Research Papers

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associates, discovered that a laser can be used to cause photocoagulation of a retinal tear by forming an adhesive scar. As a result, despite the traction, the retina does not detach. But there was much space for improvement as the ruby laser could only serve as a prevention not a cure because it could be ineffective is a large area of the retina has detached calling for major retinal detachment surgery. Slowly, the argon laser, a beam composed of blue-green light that aim on the desired portion of...

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mechanism of vision

through the conjuctiva, cornea, aqueous humour, lens and vitreous humour in that order. All these structures refract the light such that it falls on the retina. This is called focussing. Maximum focussing is done by the cornea and the lens. The light then falls on the retina. This light is received by the photoreceptors - rods and cones, on the retina. The absorbed light activates the pigments present in the rods and cones. The pigments are present on the membranes of the vesicles. Thus, the light is...

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Macular Degeneration

central vision in young children. This takes place in the macula, or the central region of the retina. The retina is where we are able to read and to distinguish colors. The main symptoms of Juvenile Macular Degeneration is a reduction in the vision. Adult Macular Degeneration is usually said to affect only those over 55 years of age. This type is found in the photosensitive cells in your retina. This includes those that control critical colors and fine detail vision. These are in the center...

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gathers light and then transforms that light into a "picture." Both also have lenses to focus the incoming light. Just as a camera focuses light onto the film to create a picture, the eye focuses light onto a specialized layer of cells, called the retina, to produce an image. The eye is essentially an opaque eyeball filled with a water-like fluid. In the front of the eyeball is a transparent opening known as the cornea. The cornea has the dual purpose of protecting the eye and refracting light as...

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Anatomy: Physiology of the Eye

gathers light and then transforms that light into a "picture." Both also have lenses to focus the incoming light. Just as a camera focuses light onto the film to create a picture, the eye focuses light onto a specialized layer of cells, called the retina, to produce an image. - A multichambered, almost spherical structure - Located in the anterior portion of the orbit *orbit is the bony structure of the skull that surrounds & protects the eye I. EXTERNAL LAYER - Fibrous coat that supports...

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Improtance of Lifestyle Management to Prevent Diabetic Retinopathy

blindness. DIABETIC RETINOPATHY is the most common diabetic eye disease and a leading cause of blindness. It involves small haemorrhages from broken arteries in the retina, with yellow waxy discharge or retinal detachment. Sometimes abnormal new blood vessels grow on the surface of the retina. It actually affects the circulatory system of the retina. ASSESSMENT: Diabetic Retinopathy is one of the important micro vascular complications of the Diabetes. The following data are the chief point of concern...

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The Path of Light and Sound

The pupil is the dark, round central opening that allows light rays to enter the internal eye. The lens is the clear, flexible disk behind the pupil. The layer of tissue that lines the posterior cavity of the eye is called the retina. Rods and cones are located in the retina. Rods are light sensitive cells that detect black and white and function in daytime and nighttime vision. Cones are light sensitive cells that detect color and respond to red, green, or blue light. The vitreous humor is the clear...

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Organ of Vision Conclusion

VI- CONCLUSION The eye is the organ of vision. It has a complex structure consisting of a transparent lens that focuses light on the retina. The retina is covered with two basic types of light-sensitive cells-rods and cones. The cone cells are sensitive to color and are located in the part of the retina called the fovea, where the light is focused by the lens. The rod cells are not sensitive to color, but have greater sensitivity to light than the cone cells. These cells are located around the...

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pigmentosa, which is a degenerative condition of the retina and this usually appears during adolescence or early adulthood. The balance of an individual is usually also affected with retinitis pigmentosa. The other part of Usher Syndrome, the hearing loss, is due to a genetic mutation affecting nerve cells in the cochlea, a sound transmitting structure in the inner ear. The same genetic effect also adversely affects photoreceptor cells in the retina leading to vision loss. Usher Syndrome is a heterogeneous...

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Eye Diseases: Nearsightedness

are able to see because the front part of the eye bends (refracts) light and points it to the back surface of the eye, called the retina. Nearsightedness occurs when the physical length of the eye is greater than the optical length. This makes it more difficult for the eyes to focus light directly on the retina. If the light rays are not clearly focused on the retina, the images you see may be blurry. Nearsightedness affects males and females equally. People who have a family history of nearsightedness...

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