Correlation between corneal and total wavefront aberrations in myopic eyes

Area of Science:

• Ophthalmology
• Optical Engineering
• Vision Science

Background:

• Corneal topography is commonly used to assess laser eye surgery outcomes.
• Optical quality depends on the entire eye's optical system, including the cornea and lens.
• Corneal aberrations are often reported, but their relation to total eye aberrations is not fully understood.

Purpose of the Study:

• To investigate the correlation between corneal aberrations and total wavefront aberrations.
• To determine the relevance of corneal aberrations for representing overall eye optical quality.
• To inform the development of more accurate customized laser eye surgery.

Main Methods:

• Thirty-three myopic patient eyes were analyzed.
• Corneal topography and Tscherning-type wavefront analysis were performed with dilated pupils (≥6 mm).
• Corneal and total wavefront aberrations were calculated up to the 6th Zernike order.

Main Results:

• Significant correlations were found for astigmatism and 3rd-order aberrations (e.g., coma).
• No significant correlations were observed for 4th, 5th, or 6th-order Zernike coefficients.
• Average Zernike coefficients for corneal aberrations were larger than those for total wavefront aberrations.

Conclusions:

• Corneal aberrations have limited utility in representing total eye optical quality, especially post-laser surgery.
• Corneal and internal ocular aberrations appear to be optically balanced.
• Customized laser eye surgery should integrate both corneal and total wavefront aberration data.