Process Essay: Seeing Through The Lens

Blurred vision and eyestrain we must look at the optic nerve within the brain. Whenever you don’t see well other factors will play into it, like headaches, soreness, and fatigue.

It is necessary to have a contact lens fitting in order to wear contacts, whether you’re planning on wearing them one-time or you’re completely transitioning from wearing eye glasses, there is more to it than just getting a prescription and deciding which contacts you want. Just as one shoe size doesn't fit all, one contact lens size doesn't fit all. If the curvature of a contact lens is too steep or too flat for your eye's shape, it could be uncomfortable or even cause damage to your eyes.

The tear layer has less effect on contact lens power, if lens is in perfect alignment onto the cornea. The degree of clearance of the lens enables the tear film to have a power effect on cornea/tear/lens system. Inadequate watery layer in the tear film causes dry eyes. As such the contact lenses become uncomfortable to wear.

The eyelids are made up of four layers, the skin, muscle, connective tissue and conjunctiva. The process of vision occurs when light waves from an object, enter through the iris. Light then passes through the lens of the eye, a double convex structure that is used to focus the light, and then reaches the retina. Inside the retina are rods and cones. Rods are used to sense light and dark, and cones are used for sensing colors. Whether the light entering the eye hits the cones or rods, a signal is sent across the optic nerve to the brain where it is processed and viewed as an image. Some issues people have with eyesight are as follows. Those who are farsighted are unable to see things clearly at a short distance, compared to a long distance. This occurs when the light that enters the eye is focused behind the retina, and not directly onto it. When the cornea is not curved enough, this happens. Nearsightedness is when one can see objects clear at a short distance, but not at a longer distance, and this is often caused by a change in the cornea. A Blind spot is the location the optic disk, where the optic nerve fiber exits, and at this location there are no cones or rods, so there is a blind spot.

According to the dictionary definition, a lens is an optical device that is used to focus or disperse light beams by the means of refraction. Moreover, the lens is made up of transparent material such as glass or clear plastic which allows the light pass through and interacts with the medium without it being absorbed. A lens is typically made to focus light unlike prisms which refracts it to show the different band of wavelength.

The cornea is the outermost layer of the eye. It is smooth, clear and referred to as the window of the eye, because the cornea allows light to pass through to the eye. The cornea also helps to shield the eye from harmful matter, such as dust and germs. It is responsible for about 65 percent of focusing power for the eye. When light enters through the cornea, it bends and refocuses the light to the retina, which begins translating the light into vision. In order to see clearly, the light rays must be precisely focused when going from the cornea into the retina. An rregular corneal surface is common and may be caused by a number of different reasons, such as genetically inherited, injury, disease or natural occurrences.

The cornea, a section of the protective and supportive part of the eye, refracts light to make it focus more on the center of the iris. In the center of the iris is an opening known as the pupil. (Mcdevitt) The iris also regulates light intake by reducing or increasing the size of the pupil. Behind the pupil is the lens of the eye. The lens keeps the light the eye is receiving focused on a specific point on the retina called the fovea. (Starr) The retina is the area in the back of the eye where all of the photoreceptors are located, neuro receptors that are sensitive to light. The fovea is the part of the retina that has the highest preponderance of photoreceptors. (Sung) The lens of the eye also integrates information by determining where the eye is focused. In order to keep the light that bounces off of an object focused on the fovea, the lens must change shape based on distance. The shape of the lens is controlled by a group of ligaments called the ciliated bodies. When the ciliated bodies tenses it causes the lens to be more round allowing the eye to focus on light coming from objects closer to the eye. When the ciliary body relaxes it allows the lens to become more flat allowing the eye to focus on objects further away. (Sung) All of the processes of the eye mentioned up to this point do not directly cause transduction; however they are another illustration of the way that the body performs integration of sensory

Nearsightedness, or myopia, is when objects far away appear blurred and objects nearby appear normal. This occurs due to a curved cornea or long eyeball. For example, a long eyeball will result in light rays improperly focusing on the retina. However, heredity and vision stress also contribute to myopia. There are certain lifestyle habits and environmental conditions which exacerbate myopia. For example, reading in poor light or watching a TV or computer screen in a dark room. Diabetes can also experience myopic like symptoms due to low blood sugar levels. Myopia can be conditionally corrected through proper eyeglasses or contact lenses. However, wearing glasses for the rest of you life can be inconvenient and uncomfortable. According to the AOA, Lasik surgery can cure nearsightedness through reshaping the cornea by removing select inner layers of

Unfortunately for them, wearing contact lenses either for long or short term has potential to cause serious and permanent vision damage. In other terms, you are inserting a foreign piece of plastic on top of your eye. This can cause things like infections, bacterial irritation, altered corneal thickness, corneal ulcers and micro-cysts if you aren’t careful. Research has proven that 1 in 2000 people who regularly use contact lenses are susceptible to vision-threatening infections, while just 1 in 10,000 LASIK recipients experience

There are many skills one must obtain when working on the hill. Having superb writing skills is critical. Writing, specifically on behalf of someone else is a difficult task, because you have to think, interpret, and write in a tone that Harry Reid would himself. Written content on behalf of the elected official must be presented clearly and professionally. The reader will gain an impression of the elected official based off of how well they write. If the concept is written in a confusing way the message will fail to get across. Pieces such as congressional statements, press releases, and constituent letters must be written with precision given that if there are multiple spelling and grammar errors it will come off as if the elected official is uneducated. May it be on behalf of an elected official, or as simple as writing an email to a coworker, poor writing skills create bad impressions and result in negative reactions.

I looked into the physics of the eye itself and into corrective lenses because I wear glasses. The human eye is a very complex piece of anatomy. Like a camera, the eye is able to refract light and produce an image that can enable someone to see.

The structure of the eye has a ciliary body is an extension of the choroid layer.  It functions with the suspensory ligament to attach and support the lens.The aqueous humor is a watery material between cornea and lens. The vitreous humor is gelatinous material within the eye.Focusing by the lens is called accommodation, focusing in humans is done by changing the shape of lens with ciliary muscles.  These muscles are part of the ciliary body. The ciliary muscles surround the lens they are attached to the lens by suspensory ligaments. When distant objects are viewed, the ciliary muscles relax, putting tension on the suspensory ligaments. The taut ligaments pull the lens, causing it to become thinner. Nearby objects cause the ciliary muscle to contract, reducing the tension on the suspensory ligaments and allowing the lens to assume a thicker shape. The cornea bends light but the lens finishes focusing. As a person ages, their ability to focus their lens decreases.  Glasses can correct for this loss of focusing ability. Focusing occurs when the eye is too long and the plane of focus is in front of the

One of her style using contact lenses in her video ‘Bad Romance’ for giving larger & more child-like effect to eyes becomes controversial. Her fans are copying the big eyed effect but it leads to eye infection, damage to vision & even blindness.

Contents Introduction 3 What is Crystalline Lens? 4 Structural of Crystalline Lens 4 Function of Crystalline Lens 4 Connections between Refractive Error and Crystalline Lens 5 Myopia 5 What is myopia? 5 What caused myopia? 5 How to solve the problem. 5 Hyperopia 6 What is hyperopia and what caused it? 6 How to solve it? 6 Most hyperopia patients will cured by them getting older. 6 Presbyopia 6 What is presbyopia and what caused it? 6 How to solve presbyopia? 6 Conclusion 7 Bibliography 8

Myopia (nearsightedness) is a common vision condition in which you can see objects near to you clearly, but obects farther away are blurry. Nearsightedness may develop gradually or rapidly, often worsening during childhood and adolscence. Nearsightedness tends to run in famillies. A basic eye exam can confirm if your nearsighted. you can easily correct the condition with eye glasses or contact lenses. Another treatment option for Myopia is surgery. The underlying cause is believed to be a combination of genetiv and environmental factors. Risk factors include doing work that involves focusing on close objects, greater time spent indoors, and a family history or the condition. The underlying Mechanism involves the length of the eyeball being too long or less commonly the lens being too strong. It is a type of Refractive Error.