Table 1.

Preoperative refractive and biometric characteristics

Characteristics	Mean±SD	Range
Age (years)	65.36±7.78	53–81
Axial length (mm)	23.55±0.82	22.32–26.63
Anterior chamber depth (mm)	3.01±0.48	2.37–4.08
Flattest meridian (K1)	43.31±1.40	40.19–46.63
Steepest meridian (K2)	43.90±1.35	41.62–46.75
Preoperative estimation error	0.02±0.13	0.15–4

Abbreviation: SD, standard deviation.