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

By Kevin M. Miller, MD

Provides present functions of optical phenomena, together with the optical issues on the topic of 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, uncomplicated ideas of geometrical optics and the present method of low imaginative and prescient administration and imaginative and prescient rehabilitation.

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

Sample text

And rendered by C. H. ) CHAPTER Brightness and 2: Geometrical Optics . 39 Irradiance The word brightness is often used imprecisely. Brightness describes a visual perception: the response of the nervous system to light entering the eye. The individual's perception of brightness depends not only on the amount of light reaching the retina but also on many other factors such as the degree of dark adaptation and presence of pathology. lrradiance is a better term for discussing image characteristics.

The critical angle ec can be calculated from Snell's law: The sine of 90° is 1; thus, 48 . 000) Surface normal A Figure 2-27 A, When light travels from a high-index medium to a low-index medium. 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.

Object and image heights are measured perpendicularly from the optical axis. By convention, object or image height is considered positive when the point is above the optical axis and negative when the point is below the axis. In general usage, magnification means enlargement; however, in optics the term magnification refers to making images larger or smaller than the object. An image is a scale model of the object, and magnification is the scale factor. Inverted images are indicated by a minus sign, whereas images with the same orientation as the object (upright images) have a positive magnification.

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