Align the slit lamp beam so that it is perpendicular to the patient's eye, passing directly through the pupil. Looking through the slit lamp, you should be able to see the red reflection, the beam should travel perfectly through the center of the pupil, and the iris should be in focus. The doctor will use a low-power microscope, along with a slit lamp, which is a high-intensity light. They will look you closely in the eye.
The slit lamp has different filters to obtain different views of the eyes. Some doctor's offices may have devices that capture digital images to track changes in the eyes over time. The slit lamp is an energy-efficient microscope combined with a high-intensity light source that can be focused as a thin beam. The Haag-Streit slit lamp is a relatively complex instrument with multiple controls.
It is necessary to know what each of the knobs does to facilitate the use of the instrument. The lower part of the knob determines the width of the split beam. The upper knob determines the vertical height of the split beam. The uppermost knob determines the brightness and color of the split beam.
The knob on the side with numbers determines the magnification of the image through the eyepieces. It's generally a good idea to start with a relatively low increase and increase the increase as needed. There is room for a teaching environment, which is not in this slit lamp. When you pull the device up, you can see it through the teaching display.
The eyepieces should be reset to zero, unless you are trying to correct the refractive error. The eyepieces can be moved to adapt to your particular interpupillary distance. The knob in front of the magnification is a stereo variator that can give or remove depth to the object you are viewing. The upper part of the slit lamp can be rotated to rotate the orientation of the split beam from vertical to horizontal, being essentially capable of rotating the beam 180 degrees.
The side screw will block or block the slit lamp so that it can move. The patient must be adjusted to his height. The knob on the left side of the slit lamp will move the chin up or down. The black mark on the side should be in line with the patient's side edge.
In addition to minor advances in lighting technology, such as the advent of LED light sources, these instruments are virtually identical to modern slit lamps. Slit lamps are often available in emergency departments, and this device is an invaluable tool for the diagnosis and evaluation of common eye conditions, eye emergencies, and systemic diseases. Taken together, these contributions allowed doctors to perform a complete diagnostic examination with the aid of the slit lamp and, perhaps most importantly, for the patient to remain comfortably seated throughout this examination. Although mastering the slit lamp takes time, the basic application for treating common eye ailments is a treatable target for both medical students and general practitioners and emergency medicine providers.
At the end of the exam, the screw on the side of the slit lamp must be tightened to lock the instrument in place. The instillation of sodium fluorescein droplets or the introduction of strips impregnated with fluorescein into the eye, followed by a slit lamp examination with the cobalt blue filter, will easily reveal corneal abrasions caused by trauma, infectious ulcerations, or dendritic lesions associated with herpes keratitis (Figure. In addition, when the slit lamp is attached to a special magnifying lens, the doctor will be able to see the retina and optic nerve located at the back of the eye. A patient's history and complaints may guide a more focused examination, but an algorithmic approach to the slit lamp examination makes it easier for the device to work properly and prevents the provider from ignoring subtle findings and moving too quickly to obvious pathology.
During the exam, the doctor will look through the microscope and adjust the light of the slit lamp to see certain parts of the eyes. The slit lamp is a stereoscopic biomicroscope that emits a focused beam of light with varying height, width and angle. Recent data suggest that a slit lamp exam may pose a greater risk than other tests, since the patient and provider face each other very closely during the exam. Several online video tutorials provide an excellent overview of the components and use of the slit lamp.
Therefore, the slit lamp is one of the pillars of the complete eye examination, allowing optometrists and ophthalmologists to evaluate each anatomical compartment of the eye. The slit lamp is an ideal tool for evaluating cataracts, since it provides information on the anatomical location of opacities indicative of etiology. The following instructions are intended to provide a quick reference for performing a slit lamp exam (see figure). In particular, care must be taken to thoroughly disinfect all surfaces of the slit lamp when patients show signs of viral or bacterial conjunctivitis.