By Kevin M. Miller, MD
Offers present functions of optical phenomena, together with the optical concerns concerning foundations of lasers, spectacles, IOLs, and refractive surgical procedure and the layout, becoming, and issues of touch lenses. additionally coated are optics of the human eye, the layout and use of ophthalmic tools, simple recommendations of geometrical optics and the present method of low imaginative and prescient administration and imaginative and prescient rehabilitation.
Read or Download 2008-2009 Basic and Clinical Science Course: Section 3: Clinical Optics (Basic and Clinical Science Course 2008-2009) PDF
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Additional resources for 2008-2009 Basic and Clinical Science Course: Section 3: Clinical Optics (Basic and Clinical Science Course 2008-2009)
It bends away from the surface normal. 8, At the critical angle. Oc. the refracted light travels in the optical interface. C, Beyond the critical angle. all light is reflected by the interface. In A and 8, light is also reflected by the interface. but this is not drawn. III/ustration developed by Kevin M. Miller, C. H. ) MD. 0°. What happens when the angle of incidence exceeds the critical angle? As Figure 2-27C shows, the angle of transmission increases as the angle of incidence increases, but the angle of transmission cannot exceed 90°.
If an object point produces its own light, such as the candle flame in the previous illustrations, it is called luminous. If it does not produce its own light, it can only be imaged if it is reflective and illuminated. Image Characteristics Images can be described by characteristics such as magnification, location, depth of focus, quality, and brightness. Some of these features will be discussed briefly. Magnification The most important characteristic of an image is its magnification. Magnification can be classified as transverse, axial, or angular.
As discussed in Chapter 1, Physical Optics, light can be regarded as an electromagnetic wave of various wavelengths. The visual system perceives different wavelengths of light as different colors, with long wavelengths appearing red, intermediate wavelengths appearing yellow or green, and short wavelengths appearing blue. In a vacuum, all wavelengths travel at the same speed. In any other medium, short wavelengths usually travel more slowly than long wavelengths. This phenomenon is called dispersion.