How to Reduce Higher-Order Aberrations
A new technology that measures subjective refraction based on point spread function targets generates better data, increases efficiency in the clinic and improves patient outcomes.
At a Glance
- Wavefront aberrometers quantify higher order aberrations objectively.
- The problem with being objective is that we do not see with our optical system, we see with our brain.
- Point Spread Function (PSF) refractors provide subjective corrections that optimize images on the retina.
- Pre-operative aberrometry with PSF optimizes refractive outcomes following LASIK or PRK surgery.
Wavefront aberrations are optical imperfections of the eye that prevent light from focusing flawlessly on the macula, resulting in a less than perfect image being perceived by an individual. Lower-order aberrations, including myopia, hyperopia and astigmatism, are common and easily corrected with spectacles, contact lenses or refractive surgery. Higher-order aberrations (HOAs), which are of the third order and above, are more complex vision errors that cannot be easily corrected (1). Examples of HOAs are coma, spherical aberration and trefoil. They can lead to symptoms such as difficulty with night vision, glare, halos around bright lights, blurring, starburst patterns, or diplopia (1).
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