American Board of Opticianry (ABO) Practice Test

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What is the role of the limbus in conjunction with the cornea and sclera?

  1. The blue portion of light on the visible spectrum

  2. Power times 0.5

  3. Measures vertex distance

  4. Characteristic of a minus lens

The correct answer is: Power times 0.5

The limbus is the outer edge of the cornea, and it plays an important role in conjunction with the cornea and sclera. Option A, the blue portion of light on the visible spectrum, is incorrect because the limbus is not directly related to light transmission or the visible spectrum. Option C, measuring vertex distance, is incorrect because the limbus is not used to measure distance. Option D, the characteristic of a minus lens, is incorrect because it refers to the optical properties of lenses, not the limbus. Therefore, the correct answer is B, as the limbus is involved in determining the power of the cornea and this calculation is often done by multiplying the average keratometry values by 0.5.

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