Clinical application of the lens haptic plane concept with transformed axial lengths

Abstract

The LHP concept in combination with thick-lens ray tracing achieved MAE comparable to that with currently used formulas. The lack of trend with axial length is important for patients with short and long eyes.

Validity of the keratometric index: Large population-based study

“…An error of 1.00 D in keratometry translates into a 1.00 D error in refractive error after IOL implantation. 21 Taking into account that the mean absolute refractive error after modern optimized phacoemulsification is approximately 0.40 to 0.50 D, [22][23][24] an improvement in the accuracy of the prediction of the posterior corneal power by approximately 0.169 D, as we found (PostP calc À PostP actual versus PostP Gullstrand À PostP actual ), is significant.…”

Sources of error in intraocular lens power calculation

“…A previous study 22 found a mean increase of 0.04 D in corneal power with an SD of 0.25 D measured by keratometry (not published in the article). However, that study was conducted before the advent of foldable IOLs and small-incision surgery.…”

“…Norrby et al 22 also developed a thick-lens formula and deliberately limited the ACD prediction to the 2 parameters required for the optical calculation (AL and corneal radius). Corneal radius is reproducibly obtained by keratometry, 4 but its conversion to corneal power (K value) varies due to use of different keratometric indices.…”

Optimizing intraocular lens power calculations in eyes with axial lengths above 25.0 mm

“…Transformation of measured ALs is an option to cope with large errors. 12,13 Therefore, in this study, we propose a method of optimizing AL in long eyes.…”