American Board of Opticianry (ABO) Practice Test

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What is specific gravity defined as?

  1. Defined as grams per cubic centimeter

  2. Applied to the back of the lens with the ridged side out

  3. Most children are born hyperopic

  4. A minus lens moved further away from the eye has is compensated with

The correct answer is: Defined as grams per cubic centimeter

Specific gravity is defined as the ratio of the density of a substance to the density of a reference substance. In the context of ophthalmic optics, specific gravity is commonly used to determine the weight of a lens material compared to the weight of an equal volume of water. Therefore, specific gravity is indeed defined as grams per cubic centimeter, as stated in option A. This definition aligns with the fundamental concept of specific gravity in the field of optics and opticianry.

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