What is EMI lens?
EMI & Blue-Cut Lenses Anti-electromagnetic radiation lens surface layer of anti-radiation material, it is a metal compounds, formed on the surface of lens in an invisible barrier, 100% filtered wave electromagnetic radiation, the functions of eye protection, the lens does not produce static electricity.
What are CR39 single vision lenses?
Crystal Vision CR39 Plastic Lenses The Crystal Vision CR39 Plastic lens for single vision distance vision is a good choice for corrections up to +/-4.00, and it is available with a variety of options such as Transtions, Tint, Standard Anti-Reflective coating, and the top-quality Crizal Coating.
Is CR-39 the same as polycarbonate?
Polycarbonate Lens Impact Test An alternative material to polycarbonate is CR39 (Columbia Resin 39), a plastic polymer commonly used in the manufacture of eyeglass lenses. Unlike polycarbonate, CR39 requires a UV coating to be added to protect eyes from the sun’s harmful rays.
Is polycarbonate better than CR-39?
In comparison to polycarbonate, CR-39 provides vastly superior optics, rating just one rung below the material with the highest ABBE value: crown glass. If you choose CR-39 lenses you commonly find that UV-protection comes at an added cost because, unlike polycarbonate, they aren’t inherently UV-protected.
How is EMI formula derived?
EMI = [P x R x (1+R)^N]/[(1+R)^N-1], where P stands for the loan amount or principal, R is the interest rate per month [if the interest rate per annum is 11%, then the rate of interest will be 11/(12 x 100)], and N is the number of monthly instalments.
Is CR-39 lens good?
That is where CR-39 lenses (Wikipedia link) improve on glass. It’s optical quality is almost as good as glass (and far better than all the other options we will look at), it is half as heavy as glass, it is much more resistant to shattering, and still very resistant to scratches.
What is the disadvantage of EMI?
no prepayment: even if you have the ready cash to pay off the loan before the tenure ends, most emi schemes will charge you a prepayment penalty ranging between 2-3% of the principal amount. 4. charges on skipping emis: for a customer, missing the emi or defaulting on payments may have significant implications.
What are the disadvantages of installments?
Installment payments can trap a borrower just like credit cards can. While it’s possible to borrow money at 0 percent under certain conditions, even paying the principal will become difficult past a certain point. Installment loans that aren’t subsidized by the merchant could get a borrower into trouble very quickly.
Does EMI include principal and interest?
EMI, which stands for equated monthly installment, is the monthly amount payments we make towards a loan we opted for. “EMI payments include contributions towards both principal and interest on the loan amount. The interest component constitutes the major portion of the EMI payment in the initial stages.