Get 2008-2009 Basic and Clinical Science Course: Section 3: PDF

By Kevin M. Miller, MD

ISBN-10: 1560558768

ISBN-13: 9781560558767

Provides present functions of optical phenomena, together with the optical issues with regards to foundations of lasers, spectacles, IOLs, and refractive surgical procedure and the layout, becoming, and problems of touch lenses. additionally lined are optics of the human eye, the layout and use of ophthalmic tools, uncomplicated options of geometrical optics and the present method of low imaginative and prescient administration and imaginative and prescient rehabilitation.

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Extra info for 2008-2009 Basic and Clinical Science Course: Section 3: Clinical Optics (Basic and Clinical Science Course 2008-2009)

Sample text

Clinical Optics amounts of rare earth elements. Until recently, clinical labs screened for diabetes by measuring the refractive index of urine. Table 2-1 lists the refractive indices of various tissues and materials of clinical interest. Refractive index varies with temperature and barometric pressure, but these changes are usually small enough to be ignored. One exception is silicone polymer. The refractive index of polymerized silicone at room temperature (20°C) differs enough from its index at eye temperature (35°C) that manufacturers of silicone intraocular lenses (IOLs) have to account for the variation.

If the surface reflects specuIarly, rays and pencils of light will be reflected back along a 90° angle to the surface. Total Internal Reflection Total internal reflection (TIR) occurs when light travels from a high-index medium to a low-index medium and the angle of incidence exceeds a certain critical angle. Under these circumstances, the incident ray does not pass through the interface; all its energy is reflected instead of transmitted. The law of reflection governs the direction of the reflected ray.

Illustration developedby KevinM. Miller, MO, and rendered by C. H. " Triangles in A and B are similar because their angles are equal. (Illustration developed by Kevin M. Miller, MO, and rendered by C. H. ) Here is a simple experiment. Use a pinhole to image the sun onto a pieee of paper 50 em behind the pinhole. What is the size of the image? 50 and that the nodal points for pinhole imaging overlap in the middle of the pinhole. The situation is illustrated in Figure 2-12. 25°) = = 50 em 500 mm 34 .

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2008-2009 Basic and Clinical Science Course: Section 3: Clinical Optics (Basic and Clinical Science Course 2008-2009) by Kevin M. Miller, MD

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