
Higher-order aberrations (HOAs) are complex imperfections in the eye’s optical system that cannot be corrected by conventional eyeglasses or contact lenses. Unlike lower-order aberrations, such as nearsightedness, farsightedness, or astigmatism, HOAs affect the way light waves pass through the eye and can cause visual distortions. These distortions may include halos, starbursts, or ghosting, and are most noticeable in low-light conditions or after refractive surgery. HOAs are often measured using wavefront technology, which provides a detailed map of how light is being focused within the eye.
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