What are Hi-Index lenses for Spectacle glasses, and how do I know if I need them?
Having thinner, lighter prescription lenses with a higher index of refraction is the ideal lens for any prescription which requires 4 or more diopters of correction. High index spectacle lenses can accomplish this for a more stylish look and comfortable feel of your new pair of spectacles. Please note that if you need contact lenses for your Keratoconus to correct your vision adequately, spectacles will not give you the same. However if you wear spectacles for your Keratoconus and they do correct your vision adequately (which usually means that your Keratoconus is mild) then you may benefit from Hi-Index lenses.
