Question

a) The Owen Aves lens
b) The Gowlland lens
c) Both a &b
d) None of the above
he Principal parameters of PAL are interrelated and include:
va The size of the distance and near areas
b) The type and intensity of the aberration
c) The depth and usable width of the progressive corridor
d) All of the above
is the basic approaches of Progressive addition lenses
a) Spherical and aspheric design
b) Hard and soft design
c) Bofocal design
8) None of the above.
lens provides a smooth transition from distance co
ent line and allowing the viewing all intermediate distances.
Bifocal
Dronressive​

Answer 1

Answer:

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