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Ophthalmic Assistant

Category - Ophthalmic Imaging

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Which exam uses placido discs to visually and quantitatively depict the amount of astigmatism present in the cornea?

Fundus photography
Heidelberg retinal tomography
Corneal topography
Slit-lamp photography

Explanation

Answer: C - Corneal topography

A corneal topography uses placido discs to visually and quantitatively depict the amount of astigmatism present in the cornea. Also known as a photokeratoscopy, this imaging technique maps the surface curvature of the cornea.

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