The macula is approximately _____________ mm in diameter.

The macula is approximately _____________ mm in diameter.

• A. 5.0 mm
• B. 5.5 mm
• C. 4.5 mm
• D. 6.0 mm

Answer: (B)

The macula is approximately 5.5 mm in diameter. This central retinal area, responsible for high-acuity vision, spans a bit over 5 millimeters across, with the fovea itself occupying about 1.5 mm of that width. Clinically, imaging references often cite 5.5 mm as the standard macular diameter, placing it in the mid-range of the possible measurements. A smaller value would underestimate the macula, while a larger one would overstate it, so 5.5 mm best fits the usual anatomical reference.

The macula is approximately 5.5 mm in diameter. This central retinal area, responsible for high-acuity vision, spans a bit over 5 millimeters across, with the fovea itself occupying about 1.5 mm of that width. Clinically, imaging references often cite 5.5 mm as the standard macular diameter, placing it in the mid-range of the possible measurements. A smaller value would underestimate the macula, while a larger one would overstate it, so 5.5 mm best fits the usual anatomical reference.