High Refractive Index

A high refractive index refers to the ability of a material to bend light to a greater degree than other materials. In the context of eyeglass lenses, a high refractive index means that the lenses can be made thinner and lighter while still providing the necessary vision correction for people with strong prescriptions. High-index lenses are particularly beneficial for individuals with severe nearsightedness (myopia), farsightedness (hyperopia), or astigmatism, as traditional lenses would be thicker and heavier to correct such conditions. These lenses help reduce the distortion that can sometimes occur with thick lenses and provide a more aesthetically pleasing appearance.

• Causes: The refractive index is a property of the material from which the lenses are made. Materials like polycarbonate, Trivex, and certain high-index plastics have a higher refractive index than standard plastic or glass, allowing them to bend light more effectively.
• Symptoms: While a high refractive index itself does not cause symptoms, people with strong prescriptions who use standard lenses may experience discomfort due to the weight and thickness of the lenses. Thicker lenses can also cause visual distortion or a "bug-eye" appearance in eyeglasses, which high-index lenses help to minimize.
• Treatment: High-index lenses are recommended for people with strong prescriptions who want thinner, lighter, and more comfortable glasses. They are available in different refractive index levels, with higher numbers indicating thinner lenses. High-index lenses can also be combined with anti-reflective coatings to improve clarity and reduce glare.