how we analysis just from the isocylinder chart can try to know the design is soft or hard design?????
how we analysis just from the isocylinder chart can try to know the design is soft or hard design?????
Generally, narrowly spaced cylinder contours indicate that the design is "harder" through that region of the lens, while widely spaced cylinder contours indicate that the design is "softer."
Darryl J. Meister, ABOM
It is wrong to define lenses as hard or soft, a lens can have both hard and soft atributes on the same lens. Technology has advanced so much, that the old hard/soft definitions are defunct. Perhaps we should work on a new analogy to describe lens surfaces
Yes, a lens may have, for instance, a softer distance periphery with a harder near periphery.Originally Posted by QDO
Darryl J. Meister, ABOM
may i ask you how you alter your dispensing decisions if a lens is hard or soft?Originally Posted by cnet_baby
i can't really to understand what u trying to ask meOriginally Posted by QDO1
well you asked: can i use an iso-cylinder chart to tell if the lens is a hard or a soft design, and I asked - if the lens is a soft design - when would you use that soft design lens, and if the chart indicated a hard design - how or who would you dispense that tooOriginally Posted by cnet_baby
or
the iso cylinder charts indicate the following:
Hard design
Lens a - hardest
lens B - quite hard
lens c - just hard
Soft design
lens x - just soft
lens y - quite soft
lens z - softest
on the basis of these results, which design would you dispense to whom, and why?
Often, emerging presbyopes and visually active wearers (requiring good dynamic vision) prefer slightly "softer" designers, while current bifocal users and sedentary wearers (especially those requiring wider fields of distance and/or near vision, such as an office worker) might prefer slightly "harder" designs.
Darryl J. Meister, ABOM
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