Glass: The original lens material, glass is rarely used today. The advantages of old fashioned glass lenses are extreme scratch resistance, and thin lenses with high optical clarity. But the disadvantages are heavy lenses, high prices, long wait to make them, and easily shattered and unsafe.
Plastic: The most popular lens material is plastic 1.50. Treated with front and back surface scratch resistance, it is one of the most inexpensive, durable and reliable materials. The disadvantages of plastic occur with higher powers. They can become thick and heavy. The impact resistance is also not recommended for children, sports and safety glasses.
Polycarbonate: A higher index than plastic (1.54), polycarbonate lenses have the highest impact resistance of all materials. Polycarbonate or Trivex is recommended for all children, sports and safety glasses. The higher index results in an inexpensive improvement in thickness and weight compared to plastic. Although improving every year, polycarbonate is a newer, less reliable material compared to plastic. Lenses can craze after 2 years.
Trivex: A newer, higher quality version of polycarbonate. Trivex is the only material we will use on drill mount frames.
Hi-Index Plastic: Newer plastic materials have been developed with higher indices. The higher the index, the thinner and lighter weight the lenses will be, and the more expensive they will be. The higher the patient's prescription is and the size of the frame will determine how much benefit will be achieved by each index.