Figure 3.

(A) Intraocular lens (IOL) powers needed to produce a uniform refractive error of +6.00 D at age 3 months (solid line) and IOL powers needed to produce emmetropia at age 6.5 years (dotted line) as a function of initial axial length. IOL powers along the dotted line will produce higher initial post-surgical hyperopia than +6.00 D. (B, solid line) Refractive errors predicted at age 6.5 years after implanting IOL powers described by the solid line in panel (A) as a function of initial axial length, i.e., that produced a uniform refractive error of +6.00 D at age 3 months. More myopia at age 6.5 years for initially smaller eyes is the result of effectivity; more diopters of change in refractive error will occur per mm of growth for initially smaller eyes. The dotted line in (B) shows the highly hyperopic refractive errors at 3 months predicted to produce emmetropia at age 6.5 years. Higher initial post-surgical hyperopia is required for smaller eyes because of effectivity.