British English plural of dioptre, referring to multiple units of optical power or multiple lens prescriptions in diopter measurements.
Standard British English plural of dioptre, adding '-s' to form the plural of the alternative spelling.
On a British eyeglass prescription, you might see '+2.0 dioptres sphere' written where an American would write 'diopters'—it's purely a spelling convention difference based on which English-speaking country you're in.
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