Study shows it diminishes image quality, including the rendering of capillaries and large vessels.

With-the-rule toricity shifted to against-the-rule, particularly in older individuals.

Changes from with-the-rule astigmatism in younger ages were three times more likely to pass through oblique astigmatism than sphere-only prescriptions towards against-the-rule in older ages, study shows.

Fully correcting or overcorrecting it at the time of cataract surgery may be wise to counteract future progression.