Abstract
AbstractThe Barrett Universal II Formula has become a popular and well-documented formula as regards its accuracy compared to third-generation formulas. The author lays out the history of IOL power calculation, the groundwork and framework for the development of his formula, as well as his related formulas to deal with special problem eyes. There is a description of his method to predict the final lens position. There is the Barrett toric calculator for toric calculations and the Barrett True K Formula for post-corneal surgery eyes. There is a careful analysis of the issue of optical biometer use of a group refractive index for axial length measurement versus the use of individual indices for each segment of the eye measured. There is a full discussion of the new Barrett True AL formula which deals with this issue. There is a full analysis of this formula compared to the Haigis, Hoffer Q, Holladay 1, and SRK/T formulas. There is also a discussion of the causes that lead to IOL power errors.
Publisher
Springer International Publishing
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