[...]... light be positioned at an angle to the scope A marked dial (angle scale index) at the base of the arm indicates degrees (Figure 1- 5 ) The microscope The Slit Lamp 3 Figure 1- 1 Topcon slit lamp model SL-2E with horizontal prism reflected light source (Photo courtesy Topcon.) Figure 1- 2 Topcon slit lamp model SL-3E with vertical illumination source (Photo courtesy Topcon.) ... dial (Figures 1- 3 A and 1- 3 B) (The power of the oculars is fixed You are actually changing the objective lens when you change magnification) This can be done during the exam itself and does not interrupt the observer or the patient Magnifications of 6X, 10 X, and 16 X are adequate for most exam purposes Higher magnifications can be achieved by removing the standard oculars and inserting stronger-powered ones... light source of the slit lamp is unique to this microscope and is the feature that makes it so adaptable for looking at the eye The light is controlled by a transformer, which provides various voltage settings The beam of light can be changed in intensity, height, width, direction or angle, and color during the exam with the flick of a lever or turn of a dial (Figure 1- 4 A and 1- 4 B) The majority of the microscopic... face of the vitreous may also be visible if the lens is clear Although there are numerous manufacturers and models of slit lamps, there are basically only two styles The first utilizes a horizontal prism reflected light source (Figure 1- 1 ) The second has a vertical illumination source (Figure 1- 2 ) The microscope is mounted on a stage that is designed for movement of the microscope and positioning of. .. the oculars and the objective lenses • The slit lamp should be located in a room free of dust and excessive heat or humidity • A supply of bulbs, fuses, and chin papers should be kept on hand 2 OptA OptT OphA OphT CL Chapter 1 Instrumentation The eye is one of the most fascinating structures of the body A great deal of this fascination hinges on the fact that it is the only organ that we can look directly... removing the standard oculars and inserting stronger-powered ones The actual magnification of what you see through the slit lamp is derived by multiplying the power of the oculars with the power of the objective lens Thus, if your oculars are 10 X and the objective lens is 1. 6X, the total magnification will be 16 X In addition to magnification, some oculars have an internal line or grid for measuring... exam is done with the light beam set at maximum height but with a narrow width that produces a slit of light, hence the name slit lamp In addition, the light source (illuminator) moves independently of the microscope unit, making various types of illumination and views of ocular structures possible A click-stop indicates when the light is directly aligned with the microscope However, most illumination... The Study Icons The Basic Bookshelf for Eyecare Professionals is quality educational material designed for professionals in all braches of eyecare Because so many of you want to expand your careers, we have made a special effort to include information needed for certification exams When these study icons appear in the margin of a Series book, it is your cue that the material next to the... entire book, it will not appear anywhere on the pages Chapter 1 The Slit Lamp K E Y P O I N T S • The slit lamp microscope is uniquely designed to give a threedimensional view of the eye and its structures • Because the slit lamp provides a binocular view, the location of abnormalities can be determined with great precision • The magnification of the microscope is provided by the oculars and the objective... designed specifically to examine the eye It is composed of a microscope and a light source The microscope is binocular; that is, it has two eyepieces, giving the binocular observer a stereoscopic (3-dimensional) view of the eye Thus, another name for the instrument is the biomicroscope Because the ocular structures can be examined dimensionally, the location of abnormalities can be determined with great precision . basic bookshelf for eyecare professionals) Includes bibliographical references and index. ISBN -1 3 : 97 8 -1 -5 564 2-7 4 7-3 (alk. paper) ISBN -1 0 : 1- 5 564 2-7 4 7-6 (alk. paper) 1. Ocular biomicroscopy. I COT Eyesight Associates of Middle Georgia Warner Robins, Ga Series Editors: Janice K. Ledford • Ken Daniels • Robert Campbell Copyright © 2006 by SLACK Incorporated ISBN -1 0 : 1- 5 564 2-7 4 7-6 ISBN -1 3 :. beam of light can be changed in intensity, height, width, direc- tion or angle, and color during the exam with the flick of a lever or turn of a dial (Figure 1- 4 A and 1- 4 B). The majority of the