Update on optical biometry and intraocular lens power calculation

Abstract

Intraocular lens (IOL) power calculation is the single most important determinant of functionally improved result of a technically precise cataract surgery. We have discussed recent advances in the field of optical biometry and IOL power calculation formulae as a means to achieve better postoperative visual outcome. The use of automated optical biometry device, the current 'gold standard' of IOL power calculation, dates back to 1999. We have highlighted the evolution of newer optical biometry devices and the technology they are based on, and their advantages and limitations. We have done technical comparison of contemporary biometers and have included contextual current review of literature. We have described newer generation IOL power formulae, IOL power calculation in high to extreme myopia, toric calculators and intraoperative aberrometry, and concluded our discussion with a note on future prospects of IOL power calculation.

Keywords

• barrett universal ii formula
• hill-radial basis activation function formula
• intraoperative wavefront aberrometry
• optical biometry
• wang-koch's nomogram