If the near power is +3.00, what is the most likely intermediate power?

• A. +3.00
• B. +1.50
• C. 0.00
• D. +2.00

Answer: (B)

The key idea is that intermediate vision requires less added power than near vision. If near power is +3.00 diopters, the intermediate distance (around arm’s length, roughly 0.66 meters) needs power close to the reciprocal of that distance: 1/0.66 ≈ +1.52 D. So +1.50 D is the best match for intermediate, since it corresponds to viewing at about 66 cm.

The other options don’t fit as well. +3.00 is the near addition, not the intermediate distance. 0.00 would provide only distance vision with no extra add. +2.00 is higher than typical intermediate for arm’s length and doesn’t align as neatly with the 0.66 m target.