Table 4.

The mean ± SD difference between the limbus and contact lens edge at the superior and inferior locations (superior minus inferior) or the temporal and nasal locations (temporal minus nasal) while the subject fixates in primary gaze. Positive numbers indicate greater distance in the superior and temporal locations. Overall, the habitual spherical lenses centered superiorly and the multifocal contact lenses centered slightly temporarily (paired t-test).

Lens type	Location	Difference (mm)	p-value
Habitual spherical contact lenses	Superior - Inferior	+0.29 ± 0.07	< 0.001
Habitual spherical contact lenses	Temporal - Nasal	+0.02 ± 0.04	0.60
Multifocal contact lenses	Superior - Inferior	+0.02 ± 0.08	0.76
Multifocal contact lenses	Temporal - Nasal	+0.09 ± 0.03	0.006