ESCRS - PP17.08 - Changes On Corneal Asphericity And Aberrometry In Myopic Patients After Presbylasik

Changes On Corneal Asphericity And Aberrometry In Myopic Patients After Presbylasik

Published 2024 - 42nd Congress of the ESCRS

Reference: PP17.08 | Type: Free paper | DOI: 10.82333/pwvw-my70

Authors: Olivia Rodríguez Quet* 1 , Juan Sánchez Navés 1 , Scott Anderson García 1 , Luis Salvá Ladaria 1

1Oftalmedic Salvá,Palma de Mallorca,Spain

Purpose

To describe and analyze modifications in corneal topography by comparing pre and postoperative asphericity (Q) values, spherical aberration, and coma in presbyLASIK patients treated with an ablation profile based in Q values.

Setting

Oftalmedic Salvá, Palma de Mallorca, Spain.

Methods

Data from 30 myopic eyes (from -2 to -5D) with corneal astigmatism less than 1 diopter and presbyopia of +1 to +2 were analyzed. Corneal topography (Pentacam) was performed, comparing preoperative and one-month postoperative values for Q, z400 and z300 for optical zones of 8 and 6 mm, and 6 and 4 mm for Zernike coefficients. Paired Student’s t-test was conducted, values below p<0.05 were considered statistically significant.

Results

Preoperative Q for an 8 mm diameter was -0.29 (range -0.56 to -0.04) postoperative was +0.33 (-0.15 to +0.98), and for 6 mm, it changed from -0.20 preoperative to 0.42 postoperative. All results showed statistical significance. Regarding optical aberrations, total RMS changed from 0.350 to 0.502 microns postoperatively. Spherical aberration (z400) in the 6 mm zone changed from 0.23 to +0.18, and in the 4 mm zone, it changed from 0.016 to -0.04 with p<0.05 for both zones. Third-order comas in 6 mm changed from -0.05 to -0.16 microns, and in the 4 mm zone, it changed from -0.004 to -0.06, with statistical significance in both cases.

Conclusions

PresbyLASIK ablation profile in myopic patients induces changes in optical aberrations, showing more negative z400 values in the 4 mm zone and slightly more positive values in the 6 mm zone. In the latter, spherical aberration also exhibits a lower value than preoperatively, though it remains positive. Vertical coma increases with little relevance in the central optical zone.