Individualized progressives: (Help me out, here)
Since with back surface progressives, you are cutting unique surfaces, then you might as well vary the parameters to create a specific lens.
Examples:
*insets can be more/less depending on distance pd and prismatic power of lens
*distribution of unwanted astigmatism can be maximized for each add power
*design can be maximized for specified vertex distance, or pantoscopic tilt, or even frame wrap ("position of wear")
*design can somehow utilize information about head and eye movements (harder or softer, shorter or longer corridor, etc.)
*design can take into account fitting height being used
This requires a free-form, or 3-axis generator.
The customization occurs on back (and front?) of lens.
This process saves labs from having to stock many lens types.
Some free-form designs utilize "generic" data, and others require "patient-specific" data from various in-office measuring devices.
Ipseo: patient specific
Gradal Individual: patient specific
Shamir Autograph:?
Sola One HD: generic population data?
It seems as though the input of these patient-specific data guides some software that maximizes some effects and minimizes others to achieve best effect. It's almost as though there is a computer analyzing data, and then spitting out the best design, not unlike what seasoned dispensers try to do when choosing between "pre-made" designs.
The upshot should be that, on the whole, the patient population should get better vision more consistently by virtue of "automatic design matching".
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