Abstract
The axial length was measured in five hundred consecutive cases using the Kretz 7200 MA ultrasound unit and an immersion technique. The reproducibility of the measurements was within ±0.2 mm when performed manually, and within ±0.05 mm when performed electronically. Intraocular lens power calculations were performed using a modification of Colenbrander's formula. We predicted within +1 diopter in 78.8% of the cases. The accuracy was up to 83% when the axial length ranged between 23.0 and 25.0 mm. Stronger power lenses were implanted in shorter eyes and weaker power lenses in longer eyes, necessitating the use of a fudge factor. Surgeons using an immersion technique for axial length measurements should use formulas yielding stronger power lenses, such as Binkhorst's formula or our modification of Colenbrander's formula, with a fudge factor for short and long eyes.
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