interval of Sturm
Also found in: Encyclopedia.(redirected from astigmatic interval)
Sturm, interval of
The linear distance between the two focal lines of an astigmatic optical system.
Syn. astigmatic interval; focal interval.
See oblique astigmatism.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
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