New PDF release: 2014-2015 Basic and Clinical Science Course (BCSC): Section

By American Academy of Ophthalmology, Dimitri T. Azar MD

ISBN-10: 1615255575

ISBN-13: 9781615255573

Part three has been thoroughly reorganized for less complicated use! you will find extra real-life medical examples, many new figures and new studying routines to aid gauge your figuring out of the cloth. part three presents a complete review of scientific optics, together with present purposes of optical phenomena comparable to lasers, spectacles, IOLs and refractive surgical procedure. offers optics of the human eye; uncomplicated thoughts of geometric optics; ophthalmic tools and phone lenses. imaginative and prescient rehabilitation can be discussed.

Upon crowning glory of part three, readers will be capable to:

Outline the rules of sunshine propagation and photo formation and paintings via a few of the primary equations that describe or degree such houses as refraction, mirrored image, magnification and vergence
Define a number of the sorts of visible conception and serve as, together with visible acuity, brightness sensitivity, colour belief and distinction sensitivity
Explain the optical ideas underlying quite a few modalities of refractive correction: spectacles, touch lenses, intraocular lenses and refractive surgical procedure

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Additional info for 2014-2015 Basic and Clinical Science Course (BCSC): Section 3: Clinical Optics

Example text

The first lens is +6 D, the second lens is+ 15 D, and the 2 lenses are separated by 35 cm. 5. The real image becomes a real object for the second lens, which produces a real image 20· cm behind the second lens with a magnification of -2. The anterior principal plane of this system is 50 cm in front of the first lens; the posterior principal plane is 20 cm behind the second lens. Often, both the anterior and posterior principal planes are virtual; in some cases, the posterior principal plane is in front of the anterior principal plane.

Light changes speed as it crosses the interface but does not change direction. If the surface reflects specularly, 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 light is reflected back into the high-index medium.

If an object is placed 1 m in front of the first lens, where is the final image and what is the transverse magnification? In paraxial optics, the way to analyze a combination of lenses is to look at each lens individually. 25. Light converges to the image and then diverges again. The image formed by the first lens becomes the object for the second lens. The image is 20 cm in front of the second lens; thus, light strikes the second lens with a vergence of -5 D and forms an image 33 cm behind the second lens.

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2014-2015 Basic and Clinical Science Course (BCSC): Section 3: Clinical Optics by American Academy of Ophthalmology, Dimitri T. Azar MD

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