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What instrument is used to verify the spectacle prescription?

  1. Lensometer

  2. Ophthalmoscope

  3. Retinoscope

  4. Phoropter

The correct answer is: Lensometer

A lensometer, also known as a lensmeter or focimeter, is used to verify the prescription of eyeglasses or contact lenses. It works by measuring the curvature of the lenses and ensuring that they match the prescription given by an eye doctor. The other options, including the ophthalmoscope, retinoscope, and phoropter, are all commonly used in eye exams, but they are not specifically designed to verify the spectacle prescription.