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To clear up your vision we must first clear up your understand! How well you see the world is about more than simply seeing things clearly at 20 feet that other can see at 20 feet. Its about the quality of your vision. Regular soft contact lenses are designed to correct LOW-ORDER optical aberrations such as myopia, hypermetropia and and regular astigmatism. Until recently its been impossible to correct HIGH-ORDER optical aberrations in the eye and when left uncorrected patients notice minor "ghosting" of images, poor night vision and glare. High Order Aberrations (HOA) are optical imperfections of the eye that cannot be measured by conventional means and are not correctable with today's lenses. Irregular astigmatism is a curvature irregularity than cannot be measured or corrected using conventional testing methods. 50% of the population have HOA that produce a noticeable reduction is vision. 15% would achieve a major benefit from having their HOA corrected and generally HAO make up approximately 20% of the total optical error. It is estimated that 40% of contact lens wearing patients have some degree of uncorrected astigmatism. Virtually every patient can experience an improvement in vision due to uncorrected and undetected aberrations that exist within the eyes. Signs of non-optimised vision are double images, low contrast and lack of crispness, lack of colour perception, glare sensitivity, night driving problems, "halos", "starburst patterns" and "comet tails"around lights at night. Historically, we ignored HAO because there was no way to measure them and no practical way to correct them. From the technology used in astronomy to subtract out optical aberrations seen through the Hubble space telescope, the Z-view Aberrometer was adapted to measure HAO of other optical lenses and the human eye. The technology has been called "wavefront" and it basically works like this. A perfectly shaped wave of light beam is shined into the eye and a distorted beam of light reflects out of the eye. A wavefront sensor measures the distortions and records them as an HAO contour map of the eyes entire visual system. Wavefront aberrometry measurements were taken from thousands of eyes and the data analysed for each power and average aberration contours curves were found for each power group. From this research, specific algorithms were developed to average out and reverse-engineer the HAO by applying individualised aspheric front surfaces combined with the appropriate power curve. Instead of a single aspheric curve "married" to a changing power curve, the ideal aspheric curvature is incorporated for each soft lens power. From this manufacturing technology was developed with nano-meter moulding accuracy to correct average HAO. The result are daily disposable contact lenses with enhanced contrast sensitivity, crisper, clearer vision particularly at night, improved visual acuity especially for moderate to high prescriptions and better print contrast for low-level presbyopia. This patented technology for HAO control has led to the introduction of daily disposable Definition AC contact lenses. All very complicated but the result is noticeable clearer vision compared to other makes.