For a pair of eyeglasses, the quality of the lenses directly affects vision correction effect and wearing comfort. After years of development and technological innovation, eyeglass lenses have evolved into various materials and functions. So how do these lenses perform, and what are their advantages and disadvantages? Before choosing glasses, we need to learn about lenses in detail.
Glass Lenses
Glass was the earliest and most common material for eyeglass lenses.It features high hardness, resistance to deformation and scratching.During production, other substances can be added to adjust the refractive index for ideal optical performance.
Advantages:High material stability, good light transmittance, effective UV protection, and certain light absorption capacity.
Disadvantages:Fragile and relatively heavy, causing many concerns during wear;large chromatic aberration, which may reduce peripheral vision.
With technological advancement, glass lenses are gradually replaced by new materials.Due to obvious shortcomings in comfort, they are fading out of the market.
Acrylic Lenses
Acrylic lenses, commonly known as organic glass, are plastic lenses developed to replace glass.They are lightweight, low-cost, and easy to manufacture and process.
Advantages:Shatter-resistant, without sharp fragments when broken;suitable for secondary processing and widely used.They serve not only as optical lenses but also in instrument parts, automotive lights, transparent tubes, and even mobile phone and TV screens.
Disadvantages:Easily deformed by heat and poor wear resistance.Thus, they are mostly used for industrial safety goggles.
PC Lenses
PC lenses, also called space lenses or cosmic lenses, are a type of thermosetting material.They are extremely lightweight yet highly tough, and are often used in bulletproof glass.
Advantages:Strong UV resistance, not easy to discolor,impact resistance far superior to other lens materials.
Disadvantages:Poor wear resistance and require coating;the relatively soft material tends to deform under pressure,so they are not suitable for plastic frames or rimless frames.
Resin Lenses
PC lenses are actually a type of resin lens, but differ in processing from standard ophthalmic resin lenses on the market.As the name suggests, resin comes from plant secretions. It is valued for its special chemical structure and uses in latex paints and adhesives, and is widely applied in both light and heavy industries.
Advantages:Lightweight and impact-resistant, just like PC lenses.With UV-resistant elements added, they provide excellent UV absorption.
Disadvantages:Also poor in wear resistance and easy to scratch,with relatively low light refractive index.
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