2011-2012 Basic and Clinical Science Course, Section 3: by Neal H. Atebara, MD PDF

By Neal H. Atebara, MD

ISBN-10: 1615251103

ISBN-13: 9781615251100

Discusses present functions of optical phenomena, together with the optical foundations of lasers, spectacles, IOLs and refractive surgical procedure. provides optics of the human eye; uncomplicated options of geometric optics; ophthalmic tools and get in touch with lenses. Discusses imaginative and prescient rehabilitation from the epidemiology of imaginative and prescient impairment, type of visible functionality deficits, sufferer evaluate and coffee imaginative and prescient administration. final significant revision 2009 2010.

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Extra resources for 2011-2012 Basic and Clinical Science Course, Section 3: Clinical Optics (Basic & Clinical Science Course)

Example text

These properties are monochromaticity, directionality, coherence, polarization, and intensity. Monochromaticity Lasers emit light at only 1 wavelength or sometimes at a combination of several wavelengths that can be separated easily. Thus a "pure;' or monochromatic, beam is obtained. 01 nm, compared with the 300-nm span of wavelengths found in white light. At best, a filter might reduce the transmission of white light to a color range (bandwidth ) of 5 nm at the expense of most of the white light's energy.

Magnification Three types of magnification are considered in geometric optics: transverse, angular, and axial. The ratio of the height of an image to the height of the corresponding object is known as transverse magnification (Fig 2-7): Transverse magnification ~ image height/object height To calculate transverse magnification, we compare the height of an object (ie, the distance an object extends above or below the optical axis) to that of its conjugate image (ie, the distance its image extends above or below the axis).

Each object point produces a 2-mm-diameter spot in the image. These spots are called blur circles. This term is somewhat misleading because off-axis object points technically produce elliptical spots in the image. In addition, this analysis ignores diffraction effects that make the spot larger and more irregular. Regardless, each object point is represented by a blur circle in the image, and the farther the image is from the pinhole, the larger the blur circle in the image. To the extent that these blur circles overlap, the image detail is reduced (blurred).

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2011-2012 Basic and Clinical Science Course, Section 3: Clinical Optics (Basic & Clinical Science Course) by Neal H. Atebara, MD

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