Difference between revisions of Guide:Measuring with differentials

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	It is not uncommon to have trouble with measuring accurately, especially for individuals who have -4 or more diopters of myopia. The reason being that there is a much smaller margin for error in a range where one cm or less makes a difference of a quarter [[diopter]]. The best way to overcome ~~this~~ issue is to measure with [[differentials]].		It is not uncommon to have trouble with measuring accurately, especially for individuals who have -4 or more diopters of myopia, or a fair bit of cylinder requirement. The reason being that there is a much smaller margin for error in a range where one cm or less makes a difference of a quarter [[diopter]]. Also for those with higher cyl needs find that directional blur adds a lot of challenge . The best way to overcome either issue is to measure with [[differentials]].
	Chances are you know your differential correction without even having to look it up so substitute your correction and edge of blur into the example.		Chances are you know your differential correction without even having to look it up so substitute your correction and edge of blur into the example.