NEUROLOGY
OCULAR PALSIES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Filters UV radiation.
|
|
|
Filters UV and IR radiation.
|
|
|
Filters IR radiation.
|
|
|
None of the above
|
Detailed explanation-1: -Uncoated plastic sunglass lenses block about 88 percent UV; polycarbonate lenses block 100 percent UV. Many cheap sunglasses use a material called triacetate. This material absorbs only about 40 percent of the UV rays.
Detailed explanation-2: -Luckily, polycarbonate lenses already block out harmful UV rays from the sun. And, unlike some other types of eyeglass lenses, they do not require any additional coating for sun protection.
Detailed explanation-3: -UV resistance on polycarbonate formulation can be added to the resin or developed as a coating. UV stabilizers are added to polycarbonate to help protect the material from the effects of exposure to the Sun. Radiation from the Sun, especially in the UV portion of the spectrum, degrades the properties of polycarbonate.