QDO1
09-19-2005, 10:19 AM
Is there a source of standardised PPL lens data, across the brands, that alows a side by side comparison of the physical aspects of the lens? It strikes me we all have our favourites, but dispensing choices are based on gut-feeling / brand loyalty or just good experience, as opposed to a scientific ananysis of the task infront of us
the data I would like at my fingertips could include for example:
Progression width at 5, 10, 15, 20 mm below fitting cross
Progression power at 5, 10, 15, 20 mm below fitting cross
Measurement at which full reading power is achieved
Above 180 distortion patterns / power error %
The problem as we all know, is that each manufacturers literature does naturally "slap some gloss" on thier particular lens design, leaving the optical professional with a pile of lens sheets all professing to be the best thing since...
People may finish that sentance as they see fit
the data I would like at my fingertips could include for example:
Progression width at 5, 10, 15, 20 mm below fitting cross
Progression power at 5, 10, 15, 20 mm below fitting cross
Measurement at which full reading power is achieved
Above 180 distortion patterns / power error %
The problem as we all know, is that each manufacturers literature does naturally "slap some gloss" on thier particular lens design, leaving the optical professional with a pile of lens sheets all professing to be the best thing since...
People may finish that sentance as they see fit