What is a 1.5 index lens?

Polycarbonate lenses have an increased index of refraction (1.586) than CR-39 plastic (1.498) and so are therefore thinner within an equal lens prescription. With an increased index , light is bent better, therefore it requires less material to achieve the eyeglass prescription making the lenses much lighter. Another significant advantage of these lenses is that they are impact resistant. It’s important to recognize that impact resistant does not mean shatterproof. They can still break, therefore official safety glasses should be worn for eye-hazardous jobs and sports.

• Also, make sure your pupils are as near to the center of the lens opening in the frame as you possibly can.
• The 1.50 Standard Index lenses will be the thickest lenses you can purchase for a typical pair of prescription glasses.
• Low lens index glasses will undoubtedly be thicker but more affordable and only provide a low vision correction level.
• Conventional glass or plastic lenses reflect about 8% of light that otherwise would

You can find cases when digital surfacing can make stronger prescriptions than traditional surfacing can in highly curved wraparound frames. Generally, people with stronger prescriptions may benefit more from high index lenses.

Cylinder Cyl

High-index lenses contain less material than regular lenses and are therefore lighter and much more comfortable. If you have a solid prescription and are searching for thinner, lighter lenses with a far more attractive appearance, high-index lenses are the way to go. Lenses with this index are made from special polycarbonate materials. They are stronger and resistant to shock, which make them a perfect choice for most people. Thinner and lighter than our basic lenses, high-index lenses are recommended for all those with combined Rx powers over -3.00/+2.00.

Lightweight lenses are a lot more of good results for farsighted prescriptions, which can make conventional lenses very heavy. We offer free basic 1.5 index lenses on all prescription eyeglasses. We offer opportunities to upgrade and add features during checkout. We make shopping on the internet for the glasses simple, efficient and safe. Conventional glass or plastic lenses reflect about 8% of light that otherwise would

Disadvantages Of High Index Lenses

The difference could be more noticeable the more nearsightedness or farsightedness you have. Not the same as single vision lenses, that have only 1, consistent focal to improve a single vision condition, progressive has multifocal. Because of this progressive lenses give a full range of vision correction, which include near, intermediate, and distance without a visible line separating them. Progressive lenses are also called progressive addition lenses , varifocal or multifocal lenses. As the prescription strength increases, lenses get thicker and heavier. Higher-index material provides thinner and lighter lenses, which makes them an excellent option for those who have a strong prescription.

The 1.74 is made thinner and flatter than standard spherical lenses, which helps reduce the magnification of the eyes. The caliber of a lens is measured on the lens index chart.