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      The reason for this is everyone has a unique residual peripheral visual sensitivity to the lens. Broadly speaking there are 2 main types of residual aberrations.
Some wearers will be more sensitive to astigmatism, while others experience greater sensitivity to power error.
   8 NIKON SINGLE VISION CATALOG UNIQUE COLLECTION SEEMAX INFINITE
          FACT: EYE COMFORT LEVELS VARY FROM PERSON TO PERSON
Even with the best lenses, prescriptions are measured at the optical centre and then averaged
across the lens. That average is applied to every wearer. The result is that each person’s comfort level will vary.
Vision Perfected
 Alex
Lens performance
Visual comfort
Julia
Lens performance
Visual comfort
Eric
Lens performance
Visual comfort
Sarah
Lens performance
Visual comfort
                                       Oblique astigmatism
Power error
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