For Keratometry, the cornea acts as which type of mirror?

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Prepare for the NBEO Physiological Optics Test with flashcards and multiple choice questions, each offering hints and explanations. Equip yourself for your exam!

Multiple Choice

For Keratometry, the cornea acts as which type of mirror?

Explanation:
In keratometry, the reflective surface is the outer (anterior) curvature of the cornea. That surface bulges toward the air, so it behaves like a convex mirror to the light from the instrument. A convex mirror diverges rays and forms a virtual, upright image that is smaller than the object. The keratometer uses the observed size and position of these reflected mire images to calculate the corneal radius of curvature. That’s why the cornea is modeled as a convex mirror in keratometry.

In keratometry, the reflective surface is the outer (anterior) curvature of the cornea. That surface bulges toward the air, so it behaves like a convex mirror to the light from the instrument. A convex mirror diverges rays and forms a virtual, upright image that is smaller than the object. The keratometer uses the observed size and position of these reflected mire images to calculate the corneal radius of curvature. That’s why the cornea is modeled as a convex mirror in keratometry.

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