Jen VanEngelenhoven wrote: > > I ordered lenses for my mom off Zenni. We got them, they looked great > but when she put them on, she can barely see out them. She has a > fairly normal prescription, but she does need progressives. > [...] > The very nice clerk tried to figure out what > might be going on and measured the base curve of the new lenses and > the base curve of the old lenses to compare. The new ones from Zenni > had a base curve of 3 and her old ones had a 6.5. > > I have two questions: > > 1. Could there be something else contributing to the blurriness?
Yes. The optical centers could be wrong. If your mom has astigmatism, the glasses might not be sitting level on her face. Her new lenses might have much worse chromatic aberration than her old ones. There are probably other things I have not thought of. In my experience, base curve alone won't make the difference between see/can't see. Any change in base curve takes some getting used to, but in my observation, flatter base curve offers better absolute visual quality (I have myopia, or a minus prescription). Higher base curve offers better peripheral vision, for any given size of lenses, due to increased "wrap". > 2. How do you find a place online that sells lenses with a 6.5 base > curve? I have only seen base curves in round numbers, like 2, 3, 4, 6, 8. 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 -~----------~----~----~----~------~----~------~--~---
