Abstract
The concept of planning refractive laser treatments using parameters other than manifest or wavefront refraction was somewhat of a novelty until topography-guided treatments came to the forefront more recently. However, both forms of treatment still have their limitations: manifest and wavefront refraction-based treatments do not take into account the effects on corneal astigmatism, and topography-guided treatments do not take into account any astigmatism behind the cornea or any cortical processing involved in the patient’s subjective astigmatic perception. The answer to optimally correcting the astigmatism of the eye is to treat somewhere between the two extremes of refractive cylinder and corneal astigmatism. This can be done using the systematic approach of Vector Planning® (ASSORT Pty. Ltd., Cheltenham, Victoria, Australia). Vector Planning is a systematic approach designed to treat the maximum amount of astigmatism of the eye, while reducing the amount of corneal astigmatism remaining postoperatively compared to treatments based on refractive parameters alone.
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