Morgans norms describe what?

Morgans norms describe what?

• A. Are fixed values with no variance.
• B. Are a range of norms within 1/2 standard deviation of the mean.
• C. Represent the maximum accepted deviations.
• D. Only apply to presbyopic individuals.

Answer: (B)

Morgans norms describe a normal range that centers on the mean and captures natural variability by using a narrow span: within one-half (0.5) standard deviation on either side of the mean. This means most values around the average fall into this band, defining what’s considered normal for a given binocular measurement. It’s not a single fixed value and it’s not the maximum allowable deviation, nor is it limited to presbyopic individuals. In practice, you’d say a measurement is within Morgans norms if it lies between mean minus 0.5 SD and mean plus 0.5 SD.

Morgans norms describe a normal range that centers on the mean and captures natural variability by using a narrow span: within one-half (0.5) standard deviation on either side of the mean. This means most values around the average fall into this band, defining what’s considered normal for a given binocular measurement. It’s not a single fixed value and it’s not the maximum allowable deviation, nor is it limited to presbyopic individuals. In practice, you’d say a measurement is within Morgans norms if it lies between mean minus 0.5 SD and mean plus 0.5 SD.