Hi pals Zenni: the #1 online eyeglasses store is online booking services, in this site guests buy glasses in resident itself.its provides stylish glasses and good quality materials in different color frames. Lowest Price Progressive Glasses in this site the guests buy the glass in low price to high. The site visitor also had the offer also don delay come and visit the site and get more information.What is PD? PD is used to control the light rays which enters into our eyes and it will restrict the more intensity of light rays which passes into our eyes. PDs equalates the light rays and passes into the focused object.No PD for you from Opticians ,Got Asked for a PD Today.