Comparison of higher order aberrations in patients with various refractive errors

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Refractive errors like myopia, hypermetropia, and astigmatism affect visual quality.
• Higher order aberrations (HOAs) contribute to visual distortions.
• Understanding aberration patterns in different refractive errors is crucial for vision correction.

Purpose of the Study:

• To compare the mean root mean square (RMS) of total HOAs, coma, and spherical aberrations.
• To investigate these aberrations across different refractive error groups: myopia, hypermetropia, and myopic astigmatism.

Main Methods:

• A prospective analytical study included 200 eyes from 121 patients (age 18-40).
• Patients were categorized into low myopia, high myopia, astigmatism, and hypermetropia groups.
• Higher order aberrations were measured using an aberrometer at a 6 mm pupil size.

Main Results:

• Mean RMS of total HOAs and spherical aberrations were highest in the hypermetropia group (0.96±0.96 and 0.30±0.42, respectively).
• These values were significantly higher than in the myopia and astigmatism groups.
• A significant negative correlation was found between spherical equivalent and HOAs/spherical aberrations in hypermetropia.

Conclusions:

• Hypermetropia is associated with significantly increased mean RMS of total HOAs and spherical aberrations.
• Spherical equivalent shows a statistically significant negative correlation with HOAs and spherical aberrations in hypermetropia.
• Findings highlight the impact of refractive error type on ocular aberration profiles.