Optometrist
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- Sep 29, 2022
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Hi Optometrist,
If everything remains the same (1.67 index lenes, diameter etc) but different in the brand (e.g Eyezen & those normal lenses with green light/filter) will there be any different in the thickness ?
If yes, which one will be more thick ? Eyezen or those normal lenses with green light/filter ?
Thanks
Usually Same index = same thickness.
However certain change in parameters would also affect the thickness:
Center thickness
Lens base curve
Lens surfacing
If the above is constant, then same index would be same thickness
Certain optical chain store is infamous for using very flat lens with thin center thickness to get very thin lenses. But making it thin this way comes with a price.
Making Center thickness too thin causes the lens to warp easily (Wavy effect)
Making it too flat gives a fishbowl effect (giddy)
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