An alternative or extended adjectival form meaning relating to dioptric principles, lens refraction, and optical power measurements.
From dioptric with the additional suffix '-al' added to the adjective, creating a variant form sometimes used in older scientific texts or formal writing.
This is a somewhat redundant form since 'dioptric' already functions as an adjective, but older scientists sometimes used 'dioptrical' in formal publications—it's like saying 'opticalness' when 'optical' already works perfectly.
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