. Author manuscript; available in PMC: 2014 Aug 21.

Published in final edited form as: Am J Ophthalmol. 2013 Sep 4;156(6):1252–1260.e2. doi: 10.1016/j.ajo.2013.07.014

TABLE 1.

Intraocular Lens Power Calculation Formulae in Infantile Eyes with Unilateral Congenital Cataract: Baseline globe axial length, keratometry, and intraocular lens power implanted for studied eyes, based on age group at surgery.

Variable	Age Group	n	Mean (Standard Deviation)
Axial Length (mm)^a	All ages	43	18.1 (1.1)
	28–48 Days	17	17.3 (0.7)
	>48 Days	26	18.7 (1.4)
Keratometry (diopters)^b	All ages	43	46.2 (2.5)
	28–48 Days	17	47.4 (1.6)
	>48 Days	26	45.5 (2.7)
Intraocular Lens Power (diopters)^c	All ages	43	29.6 (5.4)
	28–48 Days	17	30.8 (4.2)
	>48 Days	26	28.8 (6.0)

P-value <0.05 for a two-sample t-test comparing age-group means.

P-value <0.01 for a two-sample t-test comparing age-group means.

Difference not significant; since the post-operative target refraction was +8.0 diopters for the younger age group and +6.0 diopters for the older age group, the mean intraocular lens power implanted was similar between the age groups.