Lorena wrote: > > I have a relatively stronger prescription need in my left eye as > compared to my right and my local optician said I would need to > purchase polycarbonate lenses to avoid extremely thick lenses and so > that the lenses would be made as close in width to each other as > possible. > > Is this true?
No. Polycarbonate does not have a particularly high refractive index, so it does not make particularly thin lenses. Optically, it is just about the worst lens material you could possibly use. But it is tough, which makes opticians feel warm and fuzzy about their liability risks; and it commands a price premium for some unidentifiable reason, which improves opticians' bottom lines. Avoid polycarbonate lenses unless you need high-impact safety glasses. Remember there is no such thing as an unsafe lens material-- any kind of lens is more protective than no lens. A generation ago, all safety glasses were made of real glass! > Also considering my prescription: my right eye is -.50/-.50/012 and my > left eye is -1.25/ > -1.0/172, would there be a substantial thickness difference if i went > with the regular plastic lenses as opposed to the polycarbonate or > even a high index glass lens. What the heck?! You have such a minimal prescription, your lenses will be very thin regardless of material, unless the dispensing optician is a nincompoop and specifies a heavy center thickness. Why would it matter if there was a difference between the thickness of your two lenses anyway? For you to have the same thickness for both lenses would only mean that one was made unnecessarily thick just to match the other. Chalo --~--~---------~--~----~------------~-------~--~----~ Check us out at the oft-updated http://glassyeyes.blogspot.com! You received this message because you are subscribed to the Google Groups "GlassyEyes" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/glassyeyes?hl=en -~----------~----~----~----~------~----~------~--~---
