Hi-index lens material reduces lens thickness, making these lenses more comfortable and better looking by minimizing the size of visible lens edges for nearsighted wearers and reducing the magnified “bug eye” appearance associated with farsighted wearers. Essilor offers a variety of hi-index 1.67 and 1.74 lenses that are thinner and lighter than plastic—like select Eyezen™ lenses, which are available in hi-index materials.