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
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