The slit lamp is an instrument consisting of a high-intensity light source that can be focused to shine a thin sheet of light into the eye. It is used in conjunction with a biomicroscope. The lamp facilitates an examination of the anterior segment, or frontal structures 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.
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Famous quotes containing the words slit and/or lamp:
“Time, which shows so vacant, indivisible, and divine in its coming, is slit and peddled into trifles and tatters. A door is to be painted, a lock to be repaired. I want wood, or oil, or meal, or salt; the house smokes, or I have a headache; then the tax; and an affair to be transacted with a man without heart or brains; and the stinging recollection of an injurious or very awkward word,—these eat up the hours.”
—Ralph Waldo Emerson (1803–1882)
“Men’s hearts are cold. They are indifferent. Not all the coal that is dug warms the world. It remains indifferent to the lives of those who risk their life and health down in the blackness of the earth; who crawl through dark, choking crevices with only a bit of lamp on their caps to light their silent way; whose backs are bent with toil, whose very bones ache, whose happiness is sleep, and whose peace is death.”
—Mother Jones (1830–1930)