A slit lamp is a specialized microscope used by eye care professionals to examine the front structures of the eye, including the cornea, iris, and lens. It combines a high-intensity light source with a binocular microscope, allowing for detailed observation of the eye's anatomy. The light can be adjusted to create a narrow beam, or "slit," which enhances the visibility of various eye conditions. During an eye examination, the patient typically sits in front of the slit lamp while the doctor uses it to assess the health of the eyes. This tool is essential for diagnosing issues such as cataracts, glaucoma, and other ocular diseases, making it a vital instrument in ophthalmology and optometry.