what are the jobs of the diffrent parts of an human eye?
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This article gives a good description of all the parts, their purpose, and some diagrams. That should be great for your report.\nhttp://en.wikipedia.org/wiki/Eye#Anatomy
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study area. It is the only place where eyes are highly focused/concentrated. Reading under less intensity of light can affect your eye sight.
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The eye detects wavelengths of electromagnetic radiation (fancy talk for light) that fall within the visible spectrum and are of sufficient luminosity to effectively stimulate the retina to send an interpretable message to the brain via the optic nerve.\n\nLuminous and non-luminous objects as you pose the question simply implies various levels of brightness and perhaps the 'source' of the light.  \n\nThe eye simply detects light and interprets the wavelengths.  If the object is the 'luminous source' of the light - as the sun, the eye's processing of the information is no different from the 'reflected' light from an object (perhaps what you mean by non-luminous) such as a tree or rock.\n\nThe physiology is the same.  \n\nThough - an intensely luminous object, or prolonged exposure to such, can damage the eye and even result in blindess.  (Don't look directly at the sun!!!).\n\nGood question and remember - KEEP STUDYING SCIENCE!!!
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As one gets older the elasticity of the our eye lenses decreases and we require two sets of glasses, viz.\n1) Reading glasses- These are to see the things that are closer to the eyes clearly ( about 8 to 20 inches from the eyes.) This is the distance at which we usually hold any reading material, hence they are called the reading glasses.\n2) Distance or distant glasses- These are to see the things that are at a considerable distance from you for example an approach friend on the road can be clearly seen and identified with the help of these glases only.\n3) Binoculars and telescopes are just that. Binoculars and telescopes. The first is to see objects that are no normal eye can see due to the great distance ( Bird watching)\nTelescopes are for the astronomical observations that is they can see beyond the range of the binoculars.
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The ciliary muscle is a smooth muscle that affects zonules in the eye (fibers that suspend the lens in position during accommodation), enabling changes in lens shape for light focusing.
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Contact an ophthalmologist, a physician who deals with pathologies of the eye.
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Ophthalmologists are trained to do surgery. Optometrists are schooled in the developmental (behavioral, functional or environmental) aspects of vision. Optometrists are more apt to use lenses, prisms and vision therapy to enhance and improve visual function. Hope this helps :-)
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the most important diffrences between light colored eyes and dark eyes are the pigmentations of the iris and also the diameter of stroma layer of cronea. having thiner stroma layer and less pigmentations in blue eyes may result in higher injury of retina from light(especially UV).
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the eyes have rod and cones in the retina. the rod and cones are sensitive to different wave lenghts of light. they convert light to electrical impulses that are sent to the brain which translates them into mental images
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Basically, light passes through the front of the eye, the pupil, and the crystalline lens.  It hits the retina (the back of the eye), which has special cells that transform the light energy into a signal that the brain can understand.  The brain then interprets the image.  Of course, there are many other things that come into play, like how the eyes work together and how strong the eyes are.
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Aging is a broad term that refers to each part of the body getting old. But each part of the body gets old in its own way. Your eye has two main parts that are necessary for vision, the front which is a lens for focusing and adjusting the amount of light and the back which is like the film in a 35mm camera to receive the light and translate it into a message for the brain. When we age, for the most part, the changes to the front of the eye are the most noticeable. The front of the eye has a lens which is attached to little muscles which bend it so you can focus on things far away and things up close like the lens of a camera. This lens is a big piece of transparent protein that is created during development and doesn't really change much for the rest of your life, so as you get older, day to day, you bend the lens to read, and then to see far away and everything in between and it works, but because it's not perfect it gets gradually stiffer as you get older, sometimes it will get cloudy as in cataracts and sometimes the muscles that bend it will get weak, all contributing to the perceived aging of the eye.
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The photoreceptors are located in the retina of the eye.  The outer segments of the photoreceptors are responsible for catching photons of light, which initiates an electochemical signal that ultimately results in vision.  There are two main types of photoreceptors, rods and cones.  Rods are responsible for vision in lower light levels, while cones are responsible for color and most form recognition.  Rods are dispersed throughout the retina, while cones are most densely packed in the region of the retina responsible for your central, or "straight ahead," vision.  This area is called the macula.  In fact, the center of the macula, the fovea, contains only cones, and they are very densely packed in this area to allow for higher resolution of fine detail.
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His brain and heart and the part that conects it.\nAs far as the body goes his eyes.
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1 cornea\n2 anterior chamber and aqueous humor in anterior cavity\n3 pupil hole in iris\n4 posterior chamber of anterior cavity with more aqueous humor\n5 lense (which must be able to focus properly inc suspensory ligaments, ciliary body-muscle mechanism, but light not THRU here per se)\n6 posterior cavity with vitreos humor\n7 retina (hopefully lands on macula lutea, highest cones)and not the blindspot) retina cones-rods sends impulse to\n8 the sensory neurons which lead to \n9 optic nerve,then to\n10 occipital lobe of brain. Brain must work or you can't see even if all the parts of eye listed above work. \n\nNo pictures...sorry. Easy to find online pics
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The back of your eye is a multi-layered sheet of tissue called the Retina. The retina contains millions of special cells called photoreceptors. Photoreceptors contain a special molecule called Rhodopsin. Rhodopsin is broken by light into Opsin and Retinal, causing a chain of events resulting in a message to your nervous system. There are two major types of photoreceptors; rod cells and cone cells. The rhodopsin in Rod cells is most sensitive to low levels of (blue-green) light, and thus rod cells are responsible for your night vision. (notice that dark-red light doesn't leave an afterimage in the dark and destroy your night vision - it doesn't activate rod cells and use up their rhodopsin very much). Cone cells are responsible for color vision. Three types of cone cells exist, and each type contains modified rhodopsin that is most sensitive to red, blue or green light respectively. The information sent from the cone cells is sent to the fourth and third layers of the optic cortex in the back of your brain, where "Blob cells" are the first step towards integrating color information. A full-color picture is assembled from these seperately color-sensitive cells, just as the red-green-blue dots on a television screen merge into a full-color image. However, it is important to keep in mind that the separate photoreceptors are each sensitive to a RANGE of light-frequencies, of which red, blue and green are responded to best. \n     The retinas of color-blind animals do not contain all three cone cell types, if any at all. For this reason, animals rely more on motion than on fine detail to understand their visual environments. Humans can become colorblind as well, when mutations occur in any of the three varieties of rhodopsin used in cone cells. Some animals do have color vision (like birds) and others (like bees) can see light that we can't (i.e. ultraviolet). The necessary photoreceptor cells are found in the retinas of these animals.
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http://ebiomedia.com/gall/eyes/many.html
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There are many different types of lenses. Here's a site with good information.