> [...] they don’t even manufacture a toric lens for at any usable tolerance (the FDA allows a +/-0.50D tolerance to all lenses including torics)
I tried a quick google search but couldn't immediately verify. That seems horrible. Really production/specification tolerance, or just eye-correction tolerance to determine the need for a change?
I feel tempted to replace the lenses when eyes have changed by 0.25 (though delaying until 0.5 off). I have returned glasses which were mis-manufactured with the cylindrical axis for one eye off by 10 degrees.
I tried a quick google search but couldn't immediately verify. That seems horrible. Really production/specification tolerance, or just eye-correction tolerance to determine the need for a change?
I feel tempted to replace the lenses when eyes have changed by 0.25 (though delaying until 0.5 off). I have returned glasses which were mis-manufactured with the cylindrical axis for one eye off by 10 degrees.