The slit lamp is an energy-efficient microscope combined with a high-intensity light source that can be focused as a thin beam. A slit lamp is an instrument that consists of a high-intensity light source that can be focused to make a thin layer of light shine on the eye. It is used together with a biomicroscope. The lamp makes it easy to examine the front and back segments of the human eye, including the eyelid, the sclera, the conjunctiva, the iris, the natural lens and the cornea.
The binocular examination with a slit lamp provides an enlarged stereoscopic view of the eye structures in detail, allowing anatomical diagnoses to be made for a variety of eye conditions. A second portable lens is used to examine the retina. The slit lamp exam is a standard diagnostic procedure, also known as biomicroscopy. A slit lamp combines a microscope with a very bright light.
The first slit lamp concept dates back to 1911, attributed to Allvar Gullstrand and his large glare-free ophthalmoscope. The objectives of the Nikon slit lamp microscope are relatively low-power 1.0x and 1.6x objectives, which are combined with eyepieces for total magnifications ranging from 10x to 24x. The person will sit in a chair in front of the slit lamp with the chin and forehead resting on a support. A slit lamp exam is generally very safe, although medications that dilate the pupils carry some risks.
The lamp housing adjusts vertically and is centered until the image of the slot is projected onto the black surface and there is uniform illumination throughout the field of view. A 6-volt, 30-watt tungsten halogen bulb provides the light for the CS-1 slit lamp lighting system, which features a brightness adjustment dial. Ophthalmologists use Nikon slit lamp microscopes to directly examine a patient's eyes with the magnification of a binocular microscope by creating an erect stereoscopic image. The CS-1 slit lamp microscope produces a narrow beam of intense light that can illuminate the patient's cornea, aqueous humor, lens, anterior vitreous layer, or other transparent eye tissue.
The person will sit with their head resting on the microscope with a slit lamp and the doctor will place a special contact lens directly on the eyeball. It wasn't until 1919 that several improvements were made to the Gullstrand slit lamp manufactured by Vogt Henker. The slit lamp microscope, a form of oblique microscopy, uses an imaging technique similar to the optical section. One sign that can be seen on the exam with a slit lamp is a flash, which is when you see the slit lamp beam in the front chamber.
At this time, the great importance of color temperature and luminance of the light source for examinations with slit lamps was recognized and the basis for examinations with non-red light were created.