Higher order aberrations according to spherical, and astigmatic refractive errors in children

Area of Science:

• Ophthalmology
• Optometry
• Pediatric Vision

Background:

• Higher-order aberrations (HOAs) are crucial for visual function.
• The relationship between refractive error components and HOAs in children is not fully understood.
• Emmetropization and visual development are influenced by how the eye corrects for visual imperfections.

Purpose of the Study:

• To investigate the association between spherical and astigmatic refractive errors and overall, corneal, and internal HOAs in children.
• To analyze how the magnitude and angle of astigmatism relate to HOAs.
• To provide insights into the emmetropization process and visual function development.

Main Methods:

• 311 children aged 7-8 years were analyzed.
• Participants were classified by spherical equivalent refraction (myopic, emmetropic, hyperopic), astigmatism magnitude (none, low, moderate), and astigmatism angle (with-the-rule, against-the-rule, oblique).
• Refractive error and HOAs (overall, corneal, internal) were measured using an OPD-Scan III workstation.

Main Results:

• Myopic eyes exhibited higher overall, total spherical, tetrafoil, secondary astigmatism, and internal HOAs compared to emmetropic eyes.
• Astigmatism magnitude positively correlated with all overall HOAs and specific internal HOAs (coma, total coma, spherical, tetrafoil).
• Eyes with with-the-rule astigmatism showed increased RMS values for coma and total coma compared to other astigmatism angles.

Conclusions:

• Spherical and astigmatic refractive errors significantly influence higher-order aberrations.
• These findings deepen the understanding of emmetropization and visual function development in children.
• The study highlights the complex interplay between refractive error and visual optics.