Several types of imperfections, referred to as lower- and higher-order aberrations, exist within the eye and can affect both a person’s visual acuity and the quality of vision. To date, only lower-order aberrations, which include nearsightedness, farsightedness and astigmatism, could be measured and treated. However, lower-order aberrations do not account for all potential vision disorders. Higher-order aberrations can also have a significant impact on a person’s quality of vision, and cannot be corrected with glasses, contacts or conventional LASIK. According to experts in the field of ophthalmology, higher-order aberrations are linked to visual disturbances such as glare and halos that may cause night vision problems and are sometimes associated with conventional LASIK surgery.
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