High index lenses are thinner, lighter and more visually appealing.

High index lenses are suggested for those who require a strong eyeglass prescription for common vision problems, such as nearsightedness, farsightedness, or astigmatism. Hi Index lenses are thinner, lighter, more visually appealing and recommended for prescriptions +/-4.00 or higher. High-index lenses have reduced edge thickness for nearsightedness and reduced center thickness for farsightedness.