High index glass lenses are extremely dense, making them heavier and much more reflective than plastic lenses. Just as you use sunscreen to help keep the sun’s Ultra violet rays from harming your skin layer, UV treatment in eyeglass lenses blocks those same rays from damaging your eyes. Overexposure to ultraviolet light is thought to…
Parallel rays converge in the focal plane or diverge from the focal plane, independent of the angle they make with the optic axis. If you already have thick lenses, you can’t make your current glasses thinner. You’ll need to get a new couple of glasses with high index lenses to have thinner lenses. Finally, lenses…
High index lenses are 20 percent to 65 percent thinner than standard plastic lenses. In general, the stronger the prescription, the greater light can feel the material. The more that light refracts, the slower the speed of light through the material. This means the index of refraction increasing as a lens bends light more efficiently….
You’re bound to be offered multiple options for lens materials, most commonly, high index and polycarbonate. If you’re like most, you probably put far more thought into selecting your frames than your lens material. Put simply, prescription glasses bend light into our eyes at a corrected angle, in order to see clearly. The worse your…
Although more expansive than traditional glass lenses, polycarbonate lenses offer durability, UV protection, and better clarity of vision. Trivex is one of the newest optical materials in the marketplace. It combines the very best features of polycarbonate (scratch and impact resistance, UV protection, thin, and light-weight) with the great optical qualities of CR-39 plastic and…
Before you get one, though, make sure you contact your eye doctor first. Regular eyeglasses for nearsightedness have limited options for frames due to thicker edge. But with the thinner high-index lenses, you can wear an eyeglass that corrects your eyesight with more frames to pick from. The main benefit of this sort of eyeglass…
The refractive index of any substance may be the speed of light in that substance compared to the speed of light in a vacuum expressed as a ratio. Light travels fastest in a vacuum and slower through different materials. Eyeglass lenses are often categorized by their refractive index . Contact a watch doctor near you…
Trivex may be slightly thicker than polycarbonate lenses, but because of its specific gravity the weight will undoubtedly be similar. High index lenses refer to one of several different types of plastic lens material. Prescription lenses all have a definite “index”, which ranges from 1.56 to at least one 1.74. For strong prescription, the higher…
Regular lenses for a solid farsightedness prescription can be quite heavy. High-index lenses however, don’t require as much lens material and will result in more durable comfort. With thinner high-index lenses, you’ll no longer need to worry about the appearance of your lenses and you may gain a larger selection of frames available. With a…
This gathering of light to one point makes the image sharper and clearer from edge to edge. Anyone who has higher astigmatism usually will have a bigger clear field of view with atoric lenses. If you don’t need to wear glasses at all times, you can stretch your budget by purchasing a couple of reading…