Evaluation of corneal higher order aberrations in normal topographic patterns

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Corneal higher order aberrations (HOAs) impact visual quality.
• Understanding the relationship between corneal topography and HOAs is crucial for refractive surgery and diagnostics.
• The Pentacam system provides detailed corneal analysis.

Purpose of the Study:

• To characterize corneal HOAs in eyes with normal topographic patterns.
• To investigate the correlation between distinct corneal topographic patterns and HOA profiles.

Main Methods:

• Prospective, observational, comparative study of 165 eyes from 97 patients.
• Corneal tomographic analysis using the Pentacam scheimpflug system.
• Calculation of Root Mean Square (RMS) values for various HOAs and statistical analysis to compare groups.

Main Results:

• Corneal HOAs were significantly elevated in Asymmetric Bow Tie and Irregular topographic groups (p < 0.001).
• Asymmetric Bow Tie patterns showed higher total coma, while Irregular patterns exhibited higher total spherical aberration.
• Irregular patterns also demonstrated higher trefoil, tetrafoil, and higher order astigmatism, with significant differences in 3rd to 6th order RMS values.

Conclusions:

• A strong correlation exists between corneal topographic patterns and corneal HOAs in normal eyes.
• Corneal HOAs are significantly influenced by underlying topographic patterns.
• Larger sample sizes may enhance outcome accuracy in future studies.