Download e-book for kindle: 2014-2015 Basic and Clinical Science Course (BCSC): Section by American Academy of Ophthalmology, Dimitri T. Azar MD

By American Academy of Ophthalmology, Dimitri T. Azar MD

Part three has been thoroughly reorganized for less complicated use! you will discover extra real-life medical examples, many new figures and new studying routines to assist gauge your knowing of the cloth. part three offers a accomplished review of scientific optics, together with present purposes of optical phenomena equivalent to lasers, spectacles, IOLs and refractive surgical procedure. offers optics of the human eye; simple suggestions of geometric optics; ophthalmic tools and make contact with lenses. imaginative and prescient rehabilitation can be discussed.

Upon finishing touch of part three, readers will be capable to:

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

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

Example text

Collimated light entering a lens from minus optical infinity images to the posterior (secondary) focal point, FP (Fig l-29C). Collimated off-axis rays from minus infinity focus to the posterior focal plane (Fig l -29D). For a thin lens immersed in a uniform optical medium such as air or water, Fa and FP are equidistant from the lens. For a convex (plus-power) spherical lens, F. is located anterior to the lens and FP is located posterior to the lens. For a concave (minus-power) spherical lens, the points are reversed: Fa is posterior to the lens and FP' anterior to the lens.

00 D. 33). Where is the image? 1. The image is 20 cm to the right of point P'. 2. 5 cm to the right of point P'. 3. The image is 25 cm to the right of point P'. 4. The image is 33 cm to the right of point P'. 5. 00 m to the right of point P'. 6. This situation does not seem to make sense. If light starts at the object and moves to the right, how does it ever reach the lens? Putting that rather important question aside for the moment, apply the LME: ·? :? :? :? 20m Although this situation seems unrealistic, it does have practical value, as discussed later.

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. 66. 42. It is absolutely essential to calculate the position of the image formed by the first lens. Only after locating the first image is it possible to calculate the vergence oflight as it reaches the second lens.

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