Ert- Physics

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  • Topic: Myopia, Refractive surgery, LASIK
  • Pages : 3 (904 words )
  • Download(s) : 658
  • Published : September 13, 2010
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Introduction
The purpose of this report is to address the application of treating common vision problems associated with geometric optics. This report will also attend to the nature of the conditions, different methods of treating the conditions and compare the success rates for these methods. The two common vision problems that will be concentrated in this report is Myopia (Nearsightedness), Hyperopia (Farsightedness).

Nature of the Condition
Myopia is a common vision impairment in which close objects are seen clear but far objects appear blurry. Nearsightedness occurs if the eyeball is too long or the cornea, the clear front cover of the eye, has too much curvature. As a result, the light entering the eye isn’t focused correctly. This inaccuracy is called a refractive error. In other words, an over focused fuzzy image is sent to the brain.

Figure 1.1 – Myopic Eye uncorrected

With a Myopic eyeball, the point of clarity falls in front of the retina rather than on it. This makes close objects clear and far objects blurry.

Figure 1.2 – Myopic Eye corrected by a concave lens

When a Myopic Eye is correct by a concave lens, the light rays are refocussed on the retina. This now makes both close and far objects clear.

Hyperopia is also a common vision impairment that unlike Myopia, far objects are seen clear but close objects appear blurry. Farsightedness occurs if your eyeball is too short or the cornea has too little curvature, so light entering your eye is not focused correctly.

Figure 2.1 – Hyperopic Eye uncorrected

With a Hyperopic eyeball, the point of clarity falls behind the retina rather than on it. This makes far objects clear and far objects clear.

Figure 2.2- Hyperopic Eye corrected by convex lens

When a Hyperopic Eye is correct by a convex lens, the light rays are refocussed on the retina. This now makes both far and close objects clear.

Different Methods for Treating the Condition
There are many options available to...
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