Monday, April 11, 2016 10:10 AM
I have been thinking about topics that might be of interest to the readers of the Opticians Handbook and I began thinking about a number of “old devices/inspection techniques” still used today that would be fun to write about and perhaps give the reader some new information of interest and the lens measure (lens watch or lens clock) came to mind.
Monday, March 28, 2016 3:15 PM
For many of us in the ophthalmic lens business, a term frequently heard is Diopter. While it is commonly used, it has been my experience that many people are unclear about the proper meaning(s).
Monday, September 14, 2015 9:05 AM
Do you agree with the statement, "Free-form, i.e., digitally-compensated lenses produce more satisfied patients"? I know most do agree, because when I ask that question to those in attendance at my classes, almost all of them selling digital lenses say they agree.
Tuesday, March 12, 2013 5:53 PM
Base curves, we've learned are an effective way to provide adequate vision, over the entire lens, for a range of sphere and cylinder prescriptions.
Thursday, November 10, 2011 9:03 PM
The ability of a lens to refract and focus light—by either converging or diverging it—is referred to as its focal power
or refractive power
Wednesday, November 9, 2011 11:55 PM
The "best form" or "corrected curve" shape of a lens is one that provides as close to the the same vision at center and in the periphery as possible, as the eye moves normally behind the lens.
Tuesday, November 8, 2011 9:25 PM
The form of a given lens is determined by "base curve selection." The base curve
of a lens is the surface curve that serves as the basis or starting point from which the remaining curves will be calculated.
Tuesday, November 8, 2011 7:33 PM
The maximum thickness of a lens, for a given prescription, varies with the form of a lens. Flatter lens forms are slightly thinner than steeper lens forms, and vice versa.
Monday, November 7, 2011 5:33 AM
The principal impetus behind lens form selection is optical performance
. Base curves are typically chosen to provide a wide field of clear vision.