Impact Of Optotype Choice In Defocus Curve Determination

Published 2024 - 42nd Congress of the ESCRS

Reference: PP07.01 | Type: Free paper | DOI: 10.82333/vgk2-nq44

Authors: Alejandro Cerviño* ¹ , Pedro Tañá-Rivero ² , Pedro Tañá-Sanz ² , Santiago Tañá-Sanz ² , Robert Montes-Micó ¹

¹Optics &amp; Optometry &amp; Vision Sciences,University of Valencia,Burjassot,Spain, ²OftalVist Alicante,Alicante,Spain

Purpose

Assessing the impact of optotype selection on defocus curve determination in cataract patients with presbyopia-correcting intraocular lens (IOL).

Setting

Oftalvist Alicante, Alicante, Spain

Methods

Participants with Asqelio™ Trifocal IOL underwent assessment. Visual acuity and refraction were measured. Defocus curves were generated using CTS system with ETDRS or Landolt C charts under photopic conditions (85 cd/m2), ranging from +2.00D to -5.00D in 0.50D increments, six months post-surgery. Comparison of visual acuities and performance at different vergences in the defocus curves was assessed by unpaired t-test for unrelated samples. Significance was set at an alpha level of 0.05 (that is, there is 95% or greater probability that the results are not due to chance).

Results

Forty-nine patients participated (24 in ETDRS, 25 in Landolt C). Groups were similar, except for preoperative intraocular pressure and white-to-white distance. Post-surgery refraction was within ±1.00D for all patients, with 75% in ETDRS and 84% in Landolt C within ±0.50D. The average difference between groups across vergences was 0.12±0.05 logMAR units, significant at all levels (p<0.05). Differences in visual acuity were significant for distance, intermediate, and near, except for uncorrected distance VA.

Conclusions

Landolt C charts yield lower through-focus outcomes in defocus curves compared to standard ETDRS charts. This should be considered when comparing presbyopia-correcting systems in studies utilizing recognition charts due to patient characteristics.