The slit lamp allows you to examine the eye with a beam or a slit of light (instead of diffuse light) whose height and width can be adjusted. The light slit, when directed at an angle, accentuates the anatomical structures of the eye, allowing for a close inspection. A slit lamp is a microscope with a bright light that is used during an eye exam. It allows the ophthalmologist to take a closer look at the different structures in the front and inside of the eye.
It is a key tool for determining eye health and detecting eye diseases. The slit lamp allows the eye doctor to point a beam (or slit) of light at an angle at specific parts of the eye. The optometrist can narrow, widen, brighten and even filter the color of this strip of light so that you have a better view of the small, delicate parts of the eyes. The slit lamp exam is particularly important for this purpose, as it allows the eye doctor to examine all major areas of the eye.
It will then turn on the slit lamp and focus a narrow, high-intensity beam of light toward the eye.