By American Academy of Ophthalmology, Dimitri T. Azar MD
Part three has been thoroughly reorganized for simpler use! you will discover extra real-life scientific examples, many new figures and new studying workouts to aid gauge your figuring out of the fabric. part three presents a complete assessment of scientific optics, together with present functions of optical phenomena similar to lasers, spectacles, IOLs and refractive surgical procedure. provides optics of the human eye; easy techniques of geometric optics; ophthalmic tools and get in touch with lenses. imaginative and prescient rehabilitation can be discussed.
Upon final touch of part three, readers might be capable to:
Outline the foundations of sunshine propagation and picture formation and paintings via a few of the basic equations that describe or degree such houses as refraction, mirrored image, magnification and vergence
Define many of the forms of visible belief and serve as, together with visible acuity, brightness sensitivity, colour notion and distinction sensitivity
Explain the optical ideas underlying numerous 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
Suppose the object is 1 m in front of the lens. 5 cm behind the refracting surface. Second, the LME establishes a relationship between the shape of the refracting surface and its optical function. The radius of the spherical refracting surface affects the image characteristics. 5). Suppose that 1 refracting surface has a radius of 10 cm, as in the previous example, and the other has a radius of 20 cm. If an object is 1 min front of each surface, where is the image? 5 cm behind the surface. 5 D and forms an image 1 m behind the refracting surface.
The image produced by the first lens becomes the CHAPTER 1: Geometric Optics • 39 object for the second lens; the image formed by the second lens becomes the object for the third lens; and so forth. 5 cm to the right of Pi', Consider a second 2-lens example (Fig 1-40). 50 D lens. Where is the final image? Applying the LME, the first lens produces an image 50 cm to the right of Pi'. The first lens produces a real image because it is to the right of Pi'. 0 0 o 0 1 Figure 1-40 Another 2-lens example.
H. ) Paraxial Ray Tracing Through Concave Spherical Lenses In the examples we have used thus far, the lenses have been convex, or positive. Light emerges from a convex lens more convergent-or at least less divergent-than it entered. By contrast, a concave, or negative, lens makes light more divergent. The principles of paraxial ray tracing are the same; for concave spherical lenses as for convex spherical lenses. Consider a -2 D lens. Its Fa is (1/-2 D) = 50 cm behind the lens. By definition, a ray oflight directed through Fa will exit the lens parallel to the optical axis (Fig l-32A).