For some clarity on which lens material is best for you, let’s have a little face-off between the generations-old glass and the (relatively) young upstart polycarbonate. TIR Optics. Design/methodology/approach. Plastic Lenses CR-39 For years the most commonly used plastic lens material was CR-39. This hi-tech plastic lens is designed for people with stronger prescriptions. Its range is -4.00 /+2.00 or lower on the SPH and +/- 6.00 or lower on the CYL. If you’re trying to decide between plastic vs glass lens materials and don’t know all the differences, here’s what you need to know: This lens is often described as “polycarbonate composite,” because in addition to polycarbonate the lens is composed of other polymers and resins that keep the lens thinner than the 1.50 lens. Most glasses are plastic, but lightweight resin materials are stronger, with a wide variety of sports tint options. When it comes to lenses, you’ve got options: tinting, mirror coating, gradient, transition, polarized or non-polarized, and, of course — lens material. POLYESTER AND VINYL ESTER RESINS Resin/ pre-polymer/ oligomer- 40 to 100% (typically 55-65%) • Provides polymer properties, including modulus, toughness, glass transition temperature, and durability. Why? Lens materials explained Resin lens materials. Also free with single-vision prescriptions is the 1.57 mid-index lens. They don’t suit high-index (thinner lens) prescriptions, and they scratch easily. Higher prescriptions require higher index lenses, while lower prescriptions require lower index lenses. Plastic lenses are roughly half the weight of crown glass lenses. Good pervious to light, resin lens light transmittance over 2% higher than the glass lenses, at the same time, the resin lenses with coating can effectively prevent ultraviolet damage to the eyes; 3. Lens - Lens - Manufacturing optical lenses: In the manufacture of lenses, slabs of glass are cut with a glass saw or slitting disk; a piece of the desired type and shape is chipped to a rough, round blank, or the pieces may be heated to softness, rolled to a round shape, and pressed in a mold to the desired size and to approximately the desired curvature of the surfaces. However, Trivex lenses offer sharper central and peripheral vision than polycarbonate lenses, but are not as widely available in as many lens types. “CR” stands for Columbia Resin, and the number 39 denotes the type of Columbia Resin used. High Index Lenses. A 3D printer was used to print both lenses and diffraction gratings from Standard Clear PR48 photocurable resin. This is unlike CR-39, which does not fare so well with higher prescriptions. Polycarbonate is still lighter, and can be made in higher index – meaning that a strong prescription lens can still be quite thin. CR-39 was developed by PPG Industries. For safety, as they offer high impact resistance. High-index Lenses. 9. The higher a lens' index is, the thinner it becomes. Total Internal Reflection (TIR) optics, or lenses, are generally injection molded from polymers and use a refractive lens inside a reflector. Lens index is a number that describes how thick or thin your lenses are. Reactive diluent or monomer (styrene commonly)- 0-60% (typically 35-45%) • Viscosity control • Lower cost • Improve wetting behavior This is why it has become common, especially with the improvements on high lumen-density emitters, to envelope it in a TIR lens to guide pretty much all of the light toward the target. Since the refractive index is only 1.49, these types of lenses get very thick, if you need a strong correction. Scratching glass lenses is a fairly difficult and unlikely thing to do unless you drop them, whereas plastic lenses are fairly easy to scratch, requiring a bit more care in handling. 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