Slit lamp

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In ophthalmology and optometry, a slit lamp is an instrument used in conjunction with a biomicroscope and consisting of a high-intensity light source that can be focused to shine a thin sheet of light into the eye. The lamp facilitates an examination of the anterior and posterior segment of the human eye, which includes the eyelid, sclera, conjunctiva, iris, natural crystalline lens, and cornea. The binocular slit-lamp examination provides a stereoscopic magnified view of the eye structures in detail, enabling anatomical diagnoses to be made for a variety of eye conditions. A second, hand-held lens is used to examine the retina.

Read on Wikipedia · Image Ralf Roletschek, GFDL 1.2