Assessment of a new averaging algorithm to increase the sensitivity of axial eye length measurement with optical biometry in eyes with dense cataract

Abstract

No author has a financial or proprietary interest in any material or method mentioned. Additional disclosure is found in the footnotes.

New mode for measuring axial length with an optical low-coherence reflectometer in eyes with dense cataract

“…A new algorithm for a PCI-based system reported a decrease in the number of eyes that could not be read from 10.6% to 4.7%. 13 Arguably the most robust comparison of whether the Dense Cataract Measurement mode is effective is through comparing postoperative pseudophakic AL measurements and preoperative phakic AL measurements. Only a small percentage (w5%) of the cases here had preoperative and postoperative measurements available in this study, but results indicated no statistically significant difference between the new measurement mode and the standard measurement mode.…”

Measurement Reliability of Axial Length of the Human Eye by using Partial Coherence Interferometry

“…[7][8][9][10]15] However, there were no reports with the objective of comparing the minimum intensity of opacity that could offer successful measurements as a threshold value to measure the AL accurately. Our results showed that AL could be measured consistently when up to 0.77-1.33% of near-infrared Measurement Reliability of Axial Length of the Human Eye by using Partial … -Jae-hyung Kim et al 549 FIG.…”

“…Although patients with vitreous hemorrhage or severe cataract visited our hospital as a tertiary referral center in our consolidated city-county region, the failure rate was not as high when compared to previous reports using IOLmaster. [7][8][9][10] Because of the limitations of retrospective chart review, we could not obtain repeated measurements of AL using two PCIs, which could have shown whether measurability between two PCIs might differ or not,in clinical aspects. However, we inferred similar results between the two PCIs from our objective measurements of minimum intensity that offered consistent AL.…”

“…It is reported that the failure rate of AL measurement using PCI was 4.7-36.6% because of dense nuclear sclerosis, PSC, macular pathology, vitreous opacity, and other similar disorders. [7][8][9][10] These failures could arise from using devices from different manufacturers, different software versions, differences in regional or hospital/practice settings, etc. [10] Related to this, unsuccessful measurements of PCI in eyes with severe media opacities meant that the near-infrared light beam centered at 780 nm could not penetrate the opacities.…”

“…[7][8][9][10] These failures could arise from using devices from different manufacturers, different software versions, differences in regional or hospital/practice settings, etc. [10] Related to this, unsuccessful measurements of PCI in eyes with severe media opacities meant that the near-infrared light beam centered at 780 nm could not penetrate the opacities. Although we commonly knew the severities of opacity using the Lens Opacities Classification System III (LOCS Measurement Reliability of Axial Length of the Human Eye by using Partial … -Jae-hyung Kim et al III) or other grading systems, no studies have assessed the minimum near-infrared ray intensity required for constant PCI measurements of AL.…”