Conventional spherical IOLs are monofocal lenses, meaning they are designed to provide clear vision at a single focal point (usually far away for good driving vision, for example). With conventional IOLs, typically you must wear eyeglasses or contact lenses in order to use a computer, read or...
In one study,11 correction <0.3 D by dual rotating cylindrical lenses did not meaning- fully improve visual acuity, and the authors recommended that astigmatism <0.5 D be left uncorrected in refractive and cataract surgery. In a different study,12 subjects with low-to-moderate astigmatism (–...