In an industry pub. there is an add tear-out section from Seiko, discussing their new tech, "internal" back surface add design. it's a 1.67 Super Proceed Internal. available from a -10 to a +6.00 and up to a _4.00 cyl, max combined power of -10.00. Now, from an old school guy who started when it was all plus cyls, this is seriuosly confusing; spherical front surface, with up to a -4.00 cyl and the add on the back surface?? Could it be affordable?
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