The correction for a hyperopic eye with power 58.00 D to reach 60 D uses what sign in diopter notation?

The correction for a hyperopic eye with power 58.00 D to reach 60 D uses what sign in diopter notation?

• A. Negative
• B. Positive
• C. Zero
• D. Mixed

Answer: (B)

The key idea is that the sign in diopter notation shows whether the lens adds converging or diverging power. For hyperopia, you need a converging lens to move the focal point forward onto the retina. If the eye’s current refractive power is 58.00 D and you want to reach 60.00 D, you must add +2.00 D of correction. That added power is positive because it converges light. Negative would indicate a diverging lens (used for myopia), zero would mean no correction, and mixed isn’t a standard way to express this. So the sign used is positive.

The key idea is that the sign in diopter notation shows whether the lens adds converging or diverging power. For hyperopia, you need a converging lens to move the focal point forward onto the retina. If the eye’s current refractive power is 58.00 D and you want to reach 60.00 D, you must add +2.00 D of correction. That added power is positive because it converges light. Negative would indicate a diverging lens (used for myopia), zero would mean no correction, and mixed isn’t a standard way to express this. So the sign used is positive.