Factors affecting the accuracy and precision of intraocular lens power calculation with ocular biometric measurements vs immersion ultrasound biometry

Session Details

Session Title: Presented Poster Session: Imaging

Venue: Poster Village: Pod 3

First Author: : E.Stangogianni GREECE

Co Author(s): :    C. Stangogianni                       

Abstract Details

Purpose:

To compare the accuracy and precision of intraocular lens (IOL) power calculations in eyes undergoing phacoemulsification with IOL implantation using immersion ultrasound (US) and LenStar LS 900 ® biometry.

Setting:

Laserlens One Day Clinic. Ioannina-Greece

Methods:

This is a longitudinal, prospective and interventional study. We selected a cohort of 200 patients, the cataract type and severity were graded using the Lens Opacities Classification System (LOCS III) and AL measurements in all patients were attempted with different devices in the following order: LENSTAR LS900 (Haag-Streit, Bern, Switzerland)® with the new dense cataract measurement mode (DCM) and immersion A-Scan ultrasound. Patients who declined to participate in the study or without complete medical file, also all those patients with a previous diagnosis of maculopathy and astigmatism greater than - 2.00 D, were excluded.

Results:

The mean age was: 67.7 ± 13.15 years.The measurements of the anterior-posterior axis with the LenStar was possible to perform in 163 patients (81,5%) and only in 37 patients (18,5%) it was not able after 5 measurements due to the degree of the cataract nevertheless, with the DCM we were able to use the composite axial length result for the anterior-posterior axis measure. The greater accuracy of spherical equivalent variance was with optical low coherence reflectometry (0.01163 D) including those with composite axial length. There was no statistically significant differences between LenStar and immersion ultrasound (ANOVA p = 0.195).

Conclusions:

This technique has been used to optimize the refractive outcome of our patients undergoing refractive cataract surgery. The magnitude of difference between the optical low coherence reflectometry and the immersion A-scan US were not significantly different in the predicted post-operative refractive outcome. The non-contact measurements shows a great precision with the DCM in calculating IOL in dense cataracts.

Financial Disclosure:

None