Introducing Polycarbonate
Clear Lenses
The history of optical lenses is a fascinating
tale of continuous innovation and progress.
In recent years, polycarbonate has emerged
as a leading material in lens technology.
In this page, we take a closer look at the evolution
of optical lenses, spotlighting the important role of
polycarbonate lenses and showcasing the polycarbonate
options available at East Optical.
The concept of lenses has existed for centuries, dating back to ancient civilizations such as Egypt and Mesopotamia. Early lenses, often made from glass or crystal, were shaped to enhance magnification or correct vision. As craftsmanship improved and knowledge of optics expanded, lens technology evolved significantly.
During the Renaissance, the development of eyeglasses flourished, driven by Venetian craftsmen in the late 13th century. Initially crafted with glass lenses, these eyeglasses quickly became a popular solution for vision correction. Their invention marked a significant breakthrough in how people addressed vision impairments.
Fast forward to the modern era, and the emergence of polycarbonate lenses has been a game-changer in the optical industry. Polycarbonate, a durable and lightweight thermoplastic, gained prominence due to its unique set of qualities. Initially developed for aerospace applications, polycarbonate lenses found their way into eyewear due to their impact resistance and inherent UV protection.
One of the standout benefits of polycarbonate lenses is their superior impact resistance, making them a preferred choice for those with active lifestyles or working in environments where eye protection is essential. Regulations requiring polycarbonate lenses for children have further driven their adoption. In the U.S., they now make up approximately 53% of the market.
Polycarbonate lenses are much lighter than traditional glass lenses, offering greater comfort, especially for prolonged wear.
These lenses inherently block harmful UV rays without requiring additional coatings, providing essential eye protection and promoting long-term vision health.
Compared to plastic, polycarbonate has a higher refractive index of 1.59 versus 1.49, allowing for a thinner lens profile. It also provides superior strength and impact resistance. However, its main drawback is its susceptibility to scratches, which is easily addressed with a protective hard coat on both sides.
The relationship between index and thickness: the higher the index, the thinner the lenses, and the more expensive the lenses.
