Final answer:
Negative power lenses, or minus lenses with a base in (BI) prismatic effect, keep the eyes from converging too much and are prescribed for nearsighted individuals. Positive power lenses, or plus lenses with a base out (BO) prismatic effect, converging light for farsighted individuals.
Step-by-step explanation:
The influence of distance lens power on segment inset is related to the prismatic effect introduced by the lenses and how they cause the eyes to converge or diverge. The correct answer to the question is A) negative; minus, BI due to the prismatic effect at this point on the lens. Negative power lenses, also referred to as minus or concave lenses, are utilized for individuals with nearsightedness (myopia) and are thinnest at the center. These lenses cause light rays to diverge, therefore, keeping the eyes from converging as much as they would with other lenses, due to the base in (BI) prismatic effect. In contrast, a positive power lens, or plus or convex lens, is used for farsighted (hyperopic) individuals and is thickest in the center, resulting in a converging effect with a base out (BO) prismatic effect.