By Neal H. Atebara, MD
Discusses present purposes of optical phenomena, together with the optical foundations of lasers, spectacles, IOLs and refractive surgical procedure. provides optics of the human eye; uncomplicated innovations of geometric optics; ophthalmic tools and get in touch with lenses. Discusses imaginative and prescient rehabilitation from the epidemiology of imaginative and prescient impairment, class 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)
8, At the point of neutrality, the patient's retina is conjugate with the retinoscope peephole. C, With the work ing distance subtracted, the pa tient's retina is conjugate w ith optical infinity. (Illustration developed by Kevin M. Miller, M D, and rendered by C. H. ) refra ct ive error of the exa miner and that of th e patient, th e 2 reti nas are conjugate (Fig 2-31. An image of the patient's retina is present on the ex aminer's retina and vice versa. However, the patient does not "see" the examiner's retina, because it is not illuminated by the ophthalmoscope light and because this light is so bright.
Some light from each object point traverses every pinhole and produces an image. Note that only a small amount of light fro m each object point is necessary to yield a complete image. The pinhole restricts the brightness, not the size, of the image. Imag ing With lenses and Mirrors Repeat the pinhole-imaging demonstration, but replace the pinhole with a +6 D spherical trial lens, and note the improvement in the image. Vary the distances among the candle, lens, and paper, and observe the variety of different image characteristics that can be obtained from the same lens (Fig 2-5).
MD, and rendered by C. ) 10- 100 ~m across. This is better than a typical pinhole, but th e shape of the spot is very irregula r. The term blur circle is especially misleading when applied to lenses and mirrors. A better term is point spread function (PSF), which describes the way light from a single object poin t is spread out in the image. To summarize, a stigmatic image is a perfect pOin t image of an object point. However, in most cases, images are not stigmatic. Instead, light from a single object poi nt is distributed over a small region of the image known as a blur circle or, more generally, a PSF.
2011-2012 Basic and Clinical Science Course, Section 3: Clinical Optics (Basic & Clinical Science Course) by Neal H. Atebara, MD