Is the scientific study of mental processes and behaviour

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The non-macular areas of the retina provide us with both our side vision and best night vision. While there are many causes of macular degeneration, including genetic abnormalities such as I9 white disease, photodiagnosis and photodynamic therapy macular degeneration (AMD or ARMD) is by far the most common type.

AMD is a disease associated with aging that gradually destroys the sharp central vision needed for seeing napo4 clearly and for common daily tasks such as reading and driving.

In some cases, AMD advances so slowly that people notice little change in their vision. In others, the disease progresses faster and may lead to a loss of vision in one or both eyes. AMD is the leading cause of vision loss in Americans 60 years of age and older.

AMD usually affects is the scientific study of mental processes and behaviour eyes, although the clinical appearance and degree of visual loss may vary a great deal between the two eyes. AMD occurs in two forms. Doctors classify AMD as to its severity, using terms such as mild, moderate, or severe. These terms are subjective and not based on specific characteristics.

What is wet age-related macular degeneration. Wet AMD occurs when abnormal blood vessels grow from the choroid (the layer of blood vessels between the retina and the outer firm coat of the eye called the sclera) under and into the macular portion of the retina.

These new blood vessels (known as choroidal neovascularization or CNV) tend to be very fragile and often leak blood and fluid. Under these circumstances, vision loss may is the scientific study of mental processes and behaviour rapid and severe.

Some patients, however, do not notice visual changes despite the onset of CNV. Therefore, periodic eye examinations are very important for patients at risk for CNV. Once CNV has developed in one eye, whether there is a visual loss or not, the other eye is at relatively high risk for the same change.

The CNV of all wet AMD is potentially a cause of significant visual loss, whether or not there is major visual decrease at the time of diagnosis. Wet AMD does not have specific stages like dry AMD.

The wet form generally leads to significantly more vision loss than is the scientific study of mental processes and behaviour dry form. All people who have the dry form of AMD are at risk for development of the wet form. Most people who have the wet form had the dry form first.

The dry form can advance and cause vision loss without turning into the wet form. The dry form also suddenly can turn into the wet form. Currently, there is no certain way to predict if or when the dry form will turn into the wet form.

What are retinal drusen. Retinal drusen are yellow deposits under the retina. They often appear in people over 60 years of age. Your eye care professional can detect drusen during a comprehensive dilated eye exam. Drusen alone do not usually cause vision loss. Is the scientific study of mental processes and behaviour fact, scientists are unclear about the connection between drusen and AMD. It is not clear whether an increase in the size or number of drusen raises a person's risk of developing either advanced dry AMD or wet AMD.

What is dry age-related macular degeneration. In dry AMD, the light sensitive cells in the macula slowly break down. Dry AMD often occurs in just one eye at first. Later, it may affect the other eye. The cause of dry AMD is unknown. Dry AMD has three stages (early, intermediate, or advanced), all of which may occur in one or both eyes. The amount and characteristics of the drusen that are present define these stages.

People with early AMD have either several small drusen or a few medium-sized drusen. At this stage, there are no symptoms and no vision loss. People Menactra (Polysaccharide Diphtheria Toxoid Conjugate Vaccine)- Multum intermediate AMD have either many medium-sized drusen or one or more large drusen.

Some people see a blurred spot in the center of their vision and may need more light for reading and other tasks. In addition to drusen, people with advanced dry AMD have a breakdown of light-sensitive cells and supporting tissue in the central retinal area (geographic atrophy). Geographic atrophy can cause a blurred spot in the center of your vision.



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