Retina

Human Physiology Lab Special Senses Cutaneous Senses and Vision September 24/26, 2012 Our bodies are capable of sensing a wide spectrum of stimuli. We are consciously aware of some of the information our bodies perceive, but much of the information that is sensed is beyond our consciousness. Receptors responsible for perception of stimuli are found in many places: skin, eyes, ears, mouth, blood vessels, lungs, brain—frankly, every cell in the body has sensory receptors. These receptors are

The nerves are called cones, on the retina, the light sensitive tissue layer that lines the back of the eye. We have 6 to 7 million cones in the human retina, and they are responsible for color vision. If just one pigment is missing, then you may have trouble telling the difference between green and red. That is the most common type of color blindness

eyes) have initially seen. It is through these processes that we are able to perceive the world around us. By using our eyes we are able to pick up the information from our environment creating a two dimensional image that is projected on to our retina. Through internal processes this two dimensional image is turned in to a three dimensional imagine where we are able to determine

children are hyperopia, commonly known as farsightedness, which is when the eyeball is too short causing light to not focus on the retina but behind it, this causes objects far away to appear clear while the closer ones are blurry. Myopia, or nearsightedness, is when the eyeball is when the eyeball is too long causing the light to be focused on the front of the retina, in this case, objects far away will be fuzzy while the near ones are clear. Another example of emmetropia is astigmatism, which is

claim that over 70% of the visually impaired population in the United States is over 65. Age related maculopathy, also called macular degeneration, or AMD, impairs the center of vision in older individuals. The macula is the region in the back of the retina that surrounds and includes the fovea (Goldstein 1999). It is important to understand that when this degeneration progresses enough, the condition constitutes blindness because the foveal area is what is

Diabetes is a very well known disorder and serious illness. Also, Diabetes is a disorder of metabolism and the way our bodies use digested food for growth and energy. There are three types of diabetes, these include Type 1 diabetes, Type 2 diabetes, and Gestational diabetes (Bernstein). There are many factors that play into the development of this disease such as with Type 1 diabetes it is a disease that affects the way your body uses food. This type of diabetes is usually found in children as well

Retinoblastoma, Pediatric Retinoblastoma is a type of eye cancer that affects young children. Retinoblastoma starts in the light-sensitive lining in the back of your child's eyeball (retina). Retinoblastoma results when something goes wrong with eye development in the womb or early in life. Instead of developing into specialized eye cells (retinoblasts), the cells grow out of control and form a tumor (retinoblastoma). Retinoblastoma may occur in one or both eyes. It is usually diagnosed before

Law which states that as the size of the stimulus gets larger the difference must also get larger to notice a difference, which is why adding a pound to one pound is more noticeable than adding one pound to two hundred pounds. Path of Light, The Retina, Rods and Cones (10 points)

supply the eye. Attached to this layer is the lens by cililary muscles. The lens focus light to the retina and the amount of light entering is controlled by pupil dilation or constriction. Pupil dilation and constriction is regulated by the iris of the eye which consist of two layers of smooth muscle layers that contract or constrict to increase or decrease the diameter of the pupil respectively. The retina is the inner most layer of the eye. It the main site of photoreceptors that convert light energy

Retinoblastoma is a cancer that develops in the retina. The retina is a thin layer of nerve tissue in the back of the eye that senses light and sends signals to the brain to interpret what you are looking at. Retinoblastoma can occur in one or both eyes, and in some cases can spread to different parts of your body. Retinoblastoma can occur at any age but about 200 to 300 children in the United States get diagnosed each year. Retinoblastoma “usually occurs in children younger than 5 years and is most