When equipped with glasses, the Cheap Ray Bans Wayfarer Sunglasses Outlet Sale lenses significantly affect the future vision of the eye, the eye will have the appropriate protective effect, how it should choose lenses do? According to the basic material of the lens, performance and other factors to select lenses.
Methods / steps
In the choice of the lens when the degree of applicability to consider factors such as the suitability of various aspects of the self, and to choose the right lens.
Select to four glasses to see:
See whether a company has made glasses eyewear products production license;
Second look glasses optometry equipment and testing instruments whether the pass mark;
Third, look optometry, production staff whether certificates;
Four Cheap Mac Cosmetics Makeup wholesale Outlet glasses to see whether the pass mark (certificate).
Lens Material: Glass Lens; resin lenses; PC lens;
The refractive index of glass lenses stability, good wear resistance, stable optical performance, but relatively heavy, easy to break.
Glass lenses: the refractive index of stability, good wears resistance, stable optical performance, but relatively heavy, easy to break. Tree
Fat lenses (CR-39): light, safe, high transmittance, not easy to break, but the surface is easy to wear.
PC lens: high refractive index, strong, but the surface is easy to wear.
Select the glasses to be accurate optometry:
The best choice of hospital or large glasses shop for optometry.
Initial glasses and if below the age of 35 should be dilated optometry.
The elderly should also wear Tiffany and Co Key Necklace Jewelry Outlet glasses optometry, not freeloaders from the flea market to buy a mirror, so as to avoid eye injury.
After optometry, consumer’s exam wearing 15-30 minutes, myopia, hyperopia lens wearers should be wearing glasses to go walking up and down stairs; reading glasses wearers should look at the book, read the newspaper.
Any discomfort, please promptly adjust the lens optometry personnel until satisfied.
High myopia should buy a high refractive index n = 1.70,1.80 or 1.90 lenses to reduce the thickness of the lens, and not buy photochromic lenses (which refers to the glass lens resin glasses highest refractive index is 1.74.); Children should optional optical resin lenses, to ensure the safety of wear; generally advised in patients with myopia optical slightly red or bluish purple red chip optical film can be Secretary to ensure that block most ultraviolet radiation on the human eye infringed; water King polarization operator selected pieces. In order to increase the light transmittance, improved visual clarity, optional coated Fake Oakleys Frogskins Sunglasses Cheap for Sale lenses.