Camera lenses are often described as being 'aspherical', but what does it mean, and is it the only way to design a lens? A lot of lenses are spherical, though. What we mean by “spherical” is usually ...

Please provide your email address to receive an email when new articles are posted on . Toric lenses led to better visual acuity than spherical lenses for astigmatism of at least –0.75 D . Clinicians ...