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Characteristics of the general sample (n = 49).
| Variable | Mean | Standard Deviation | 95% Confidence Interval | |
|---|---|---|---|---|
| Lower | Upper | |||
| Age (years) | 27.67 | 7.10 | 25.66 | 29.69 |
| M (D) | −0.86 | 1.62 | −1.32 | −0.41 |
| J0 (D) | −0.01 | 0.31 | −0.09 | 0.08 |
| J45 (D) | −0.03 | 0.15 | −0.07 | 0.02 |
M: spherical equivalent; J0 and J45: Jackson crossed cylinder lenses, representing the three components of refractive error in power vector notation; D: diopters.
