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Ophthalmic Assistant

Category - Ophthalmic Imaging

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To illuminate an area across the surface of a structure, what kind of slit-beam illumination do you need?

Direct
Indirect
Tangential
Retroillumination

Explanation

Answer: C - Tangential

To illuminate an area across the surface of a structure using a slit beam, tangential illumination is necessary. This technique is accomplished by swinging the slit-lamp arm to the side at an oblique angle. Tangential lighting is used to observe the anterior and posterior cornea, iris, and the anterior lens.

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