SiVIEW makes this decision based on a careful analysis of the relevance of the cylinder correction to the patient’s vision. This depends on the cylinder power and the visual acuity achieved. For example, if the cylinder is low with an oblique or vertical axis, SiVIEW compares the cylinder correction with an equivalent sphere, particularly in younger patients, to determine whether omitting the cylinder could provide better or equivalent visual quality due to accommodative factors.